php经典分页
<span style="color: #000000">php </span><span style="color: #0000ff">class</span><span style="color: #000000"> PageView{ </span><span style="color: #008000">/*</span><span style="color: #008000">*页码*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$pageNo</span> = 1<span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">*页大小*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$pageSize</span> = 20<span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">*共多少页*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$pageCount</span> = 0<span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">*总记录数*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$totalNum</span> = 0<span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">*偏移量,当前页起始行*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$offSet</span> = 0<span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">*每页数据*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$pageData</span> = <span style="color: #0000ff">array</span><span style="color: #000000">(); </span><span style="color: #008000">/*</span><span style="color: #008000">*是否有上一页*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$hasPrePage</span> = <span style="color: #0000ff">true</span><span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">*是否有下一页*</span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$hasNextPage</span> = <span style="color: #0000ff">true</span><span style="color: #000000">; </span><span style="color: #0000ff">public</span> <span style="color: #800080">$pageNoList</span> = <span style="color: #0000ff">array</span><span style="color: #000000">(); </span><span style="color: #0000ff">public</span> <span style="color: #800080">$jsFunction</span> ='jsFunction'<span style="color: #000000">; </span><span style="color: #008000">/*</span><span style="color: #008000">* * * @param unknown_type $count 总行数 * @param unknown_type $size 分页大小 * @param unknown_type $string </span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">function</span> __construct(<span style="color: #800080">$count</span>=0, <span style="color: #800080">$size</span>=20,<span style="color: #800080">$pageNo</span>=1,<span style="color: #800080">$pageData</span> =<span style="color: #0000ff">array</span>(),<span style="color: #800080">$jsFunction</span>='jsFunction'<span style="color: #000000">){ </span><span style="color: #800080">$this</span>->totalNum = <span style="color: #800080">$count</span>;<span style="color: #008000">//</span><span style="color: #008000">总记录数</span> <span style="color: #800080">$this</span>->pageSize = <span style="color: #800080">$size</span>;<span style="color: #008000">//</span><span style="color: #008000">每页大小</span> <span style="color: #800080">$this</span>->pageNo = <span style="color: #800080">$pageNo</span><span style="color: #000000">; </span><span style="color: #008000">//</span><span style="color: #008000">计算总页数</span> <span style="color: #800080">$this</span>->pageCount = <span style="color: #008080">ceil</span>(<span style="color: #800080">$this</span>->totalNum/<span style="color: #800080">$this</span>-><span style="color: #000000">pageSize); </span><span style="color: #800080">$this</span>->pageCount = (<span style="color: #800080">$this</span>->pageCount$this-><span style="color: #000000">pageCount; </span><span style="color: #008000">//</span><span style="color: #008000">检查pageNo</span> <span style="color: #800080">$this</span>->pageNo = <span style="color: #800080">$this</span>->pageNo == 0 ? 1 : <span style="color: #800080">$this</span>-><span style="color: #000000">pageNo; </span><span style="color: #800080">$this</span>->pageNo = <span style="color: #800080">$this</span>->pageNo > <span style="color: #800080">$this</span>->pageCount? <span style="color: #800080">$this</span>->pageCount : <span style="color: #800080">$this</span>-><span style="color: #000000">pageNo; </span><span style="color: #008000">//</span><span style="color: #008000">计算偏移</span> <span style="color: #800080">$this</span>->offset = ( <span style="color: #800080">$this</span>->pageNo - 1 ) * <span style="color: #800080">$this</span>-><span style="color: #000000">pageSize; </span><span style="color: #008000">//</span><span style="color: #008000">计算是否有上一页下一页</span> <span style="color: #800080">$this</span>->hasPrePage = <span style="color: #800080">$this</span>->pageNo == 1 ?<span style="color: #0000ff">false</span>:<span style="color: #0000ff">true</span><span style="color: #000000">; </span><span style="color: #800080">$this</span>->hasNextPage = <span style="color: #800080">$this</span>->pageNo >= <span style="color: #800080">$this</span>->pageCount ?<span style="color: #0000ff">false</span>:<span style="color: #0000ff">true</span><span style="color: #000000">; </span><span style="color: #800080">$this</span>->pageData = <span style="color: #800080">$pageData</span><span style="color: #000000">; </span><span style="color: #800080">$this</span>->jsFunction = <span style="color: #800080">$jsFunction</span><span style="color: #000000">; } </span><span style="color: #008000">/*</span><span style="color: #008000">* * 分页算法 * @return </span><span style="color: #008000">*/</span> <span style="color: #0000ff">private</span> <span style="color: #0000ff">function</span><span style="color: #000000"> generatePageList(){ </span><span style="color: #800080">$pageList</span> = <span style="color: #0000ff">array</span><span style="color: #000000">(); </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>->pageCount ){ <span style="color: #0000ff">for</span>(<span style="color: #800080">$i</span>=0;<span style="color: #800080">$i</span>$this->pageCount;<span style="color: #800080">$i</span>++<span style="color: #000000">){ </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$i</span>+1<span style="color: #000000">); } }</span><span style="color: #0000ff">else</span><span style="color: #000000">{ </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>->pageNo ){ <span style="color: #0000ff">for</span>(<span style="color: #800080">$i</span>=0;<span style="color: #800080">$i</span>$i++<span style="color: #000000">){ </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$i</span>+1<span style="color: #000000">); } </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,-1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>-><span style="color: #000000">pageCount); }</span><span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>->pageNo > <span style="color: #800080">$this</span>->pageCount - 4<span style="color: #000000">){ </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,-1<span style="color: #000000">); </span><span style="color: #0000ff">for</span>(<span style="color: #800080">$i</span>=5;<span style="color: #800080">$i</span>>0;<span style="color: #800080">$i</span>--<span style="color: #000000">){ </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>->pageCount - <span style="color: #800080">$i</span>+1<span style="color: #000000">); } }</span><span style="color: #0000ff">else</span> <span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>->pageNo > 4 && <span style="color: #800080">$this</span>->pageNo $this->pageCount - 4<span style="color: #000000">){ </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,-1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>->pageNo -2<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>->pageNo -1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>-><span style="color: #000000">pageNo); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>->pageNo + 1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>->pageNo + 2<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,-1<span style="color: #000000">); </span><span style="color: #008080">array_push</span>(<span style="color: #800080">$pageList</span>,<span style="color: #800080">$this</span>-><span style="color: #000000">pageCount); } } </span><span style="color: #0000ff">return</span> <span style="color: #800080">$pageList</span><span style="color: #000000">; } </span><span style="color: #008000">/*</span><span style="color: #008000">** * 创建分页控件 * @param * @return String </span><span style="color: #008000">*/</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">function</span><span style="color: #000000"> echoPageAsDiv(){ </span><span style="color: #800080">$pageList</span> = <span style="color: #800080">$this</span>-><span style="color: #000000">generatePageList(); </span><span style="color: #800080">$pageString</span> ="<div class="pagination"><div class="page-bottom">"<span style="color: #000000">; </span><span style="color: #0000ff">if</span>(!<span style="color: #0000ff">empty</span>(<span style="color: #800080">$pageList</span><span style="color: #000000">)){ </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>->pageCount >1<span style="color: #000000">){ </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>-><span style="color: #000000">hasPrePage){ </span><span style="color: #800080">$pageString</span> = <span style="color: #800080">$pageString</span> ."$this->jsFunction . "(" . (<span style="color: #800080">$this</span>->pageNo-1) . ")\">上一页"<span style="color: #000000">; } </span><span style="color: #0000ff">foreach</span> (<span style="color: #800080">$pageList</span> <span style="color: #0000ff">as</span> <span style="color: #800080">$k</span>=><span style="color: #800080">$p</span><span style="color: #000000">){ </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>->pageNo == <span style="color: #800080">$p</span><span style="color: #000000">){ </span><span style="color: #800080">$pageString</span> = <span style="color: #800080">$pageString</span> ."<span class="page-cur">" . <span style="color: #800080">$this</span>->pageNo . "</span>"<span style="color: #000000">; </span><span style="color: #0000ff">continue</span><span style="color: #000000">; } </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$p</span> == -1<span style="color: #000000">){ </span><span style="color: #800080">$pageString</span> = <span style="color: #800080">$pageString</span> ."<span class="page-break">...</span>"<span style="color: #000000">; </span><span style="color: #0000ff">continue</span><span style="color: #000000">; } </span><span style="color: #800080">$pageString</span> = <span style="color: #800080">$pageString</span> ."$this->jsFunction . "(" . <span style="color: #800080">$p</span> . ")\">" . <span style="color: #800080">$p</span> . ""<span style="color: #000000">; } </span><span style="color: #0000ff">if</span>(<span style="color: #800080">$this</span>-><span style="color: #000000">hasNextPage){ </span><span style="color: #800080">$pageString</span> = <span style="color: #800080">$pageString</span> ."$this->jsFunction . "(" . (<span style="color: #800080">$this</span>->pageNo+1) . ")\">下一页"<span style="color: #000000">; } } } </span><span style="color: #800080">$pageString</span> = <span style="color: #800080">$pageString</span> .("</div></div>"<span style="color: #000000">); </span><span style="color: #0000ff">return</span> <span style="color: #800080">$pageString</span><span style="color: #000000">; } } </span>?>
<span style="color: #800000"><style type="text/css"> <!-- .pagination </style></span>{<span style="color: #ff0000">font-family</span>:<span style="color: #0000ff"> Tahoma</span>;<span style="color: #ff0000">overflow</span>:<span style="color: #0000ff"> hidden</span>;<span style="color: #ff0000"> padding-top</span>:<span style="color: #0000ff"> 12px</span>;<span style="color: #ff0000"> text-align</span>:<span style="color: #0000ff"> center</span>;}<span style="color: #800000"> .pagination-tab </span>{<span style="color: #ff0000"> margin-bottom</span>:<span style="color: #0000ff"> 20px</span>;}<span style="color: #800000"> .pagination a, .pagination .page-cur, .pagination .page-prev_g, .pagination .page-prev, .pagination .page-next, .pagination .page-next_g, .pagination .page-break, .pagination .page-skip </span>{<span style="color: #ff0000"> display</span>:<span style="color: #0000ff"> inline-block</span>;<span style="color: #ff0000">font-family</span>:<span style="color: #0000ff"> Tahoma,SimSun,Arial</span>;<span style="color: #ff0000"> height</span>:<span style="color: #0000ff"> 22px</span>;<span style="color: #ff0000">line-height</span>:<span style="color: #0000ff">22px</span>;<span style="color: #ff0000"> margin</span>:<span style="color: #0000ff"> 0</span>;<span style="color: #ff0000"> min-width</span>:<span style="color: #0000ff"> 16px</span>;<span style="color: #ff0000">padding</span>:<span style="color: #0000ff"> 0 5px</span>;<span style="color: #ff0000"> text-align</span>:<span style="color: #0000ff"> center</span>;<span style="color: #ff0000"> vertical-align</span>:<span style="color: #0000ff"> top</span>;<span style="color: #ff0000"> white-space</span>:<span style="color: #0000ff"> nowrap</span>;}<span style="color: #800000"> .pagination a, .pagination .page-prev_g, .pagination .page-prev, .pagination .page-next, .pagination .page-next_g, .pagination .page-cur, .pagination .page-break </span>{<span style="color: #ff0000"> border</span>:<span style="color: #0000ff"> 1px solid #ed3d83</span>;<span style="color: #ff0000"> color</span>:<span style="color: #0000ff">#e9357d</span>;<span style="color: #ff0000"> font-weight</span>:<span style="color: #0000ff">bold</span>;}<span style="color: #800000"> .pagination a:hover </span>{<span style="color: #ff0000"> border</span>:<span style="color: #0000ff"> 1px solid #ed3d83</span>;<span style="color: #ff0000">text-decoration</span>:<span style="color: #0000ff"> none</span>;<span style="color: #ff0000"> background-color</span>:<span style="color: #0000ff">#f95f9d</span>;<span style="color: #ff0000"> color</span>:<span style="color: #0000ff">#fff</span>;}<span style="color: #800000"> .pagination .page-prev_g, .pagination .page-prev, .pagination .page-next, .pagination .page-next_g </span>{<span style="color: #ff0000"> width</span>:<span style="color: #0000ff"> 36px</span>;<span style="color: #ff0000"> background-image</span>:<span style="color: #0000ff"> url(../static/img/page.gif)</span>;}<span style="color: #800000"> .pagination .page-prev </span>{<span style="color: #ff0000"> background-position</span>:<span style="color: #0000ff"> -0px -38px</span>;<span style="color: #ff0000"> padding-left</span>:<span style="color: #0000ff"> 16px</span>;}<span style="color: #800000"> .pagination .page-prev_g </span>{<span style="color: #ff0000"> background-position</span>:<span style="color: #0000ff">0px -59px</span>;<span style="color: #ff0000"> padding-left</span>:<span style="color: #0000ff"> 16px</span>;<span style="color: #ff0000"> color</span>:<span style="color: #0000ff">#cbcbcb</span>;<span style="color: #ff0000"> font-weight</span>:<span style="color: #0000ff">normal</span>;}<span style="color: #800000"> .pagination .page-next </span>{<span style="color: #ff0000"> background-position</span>:<span style="color: #0000ff"> 0px 0px</span>;<span style="color: #ff0000"> padding-right</span>:<span style="color: #0000ff"> 16px</span>;<span style="color: #ff0000"> font-weight</span>:<span style="color: #0000ff">normal</span>;}<span style="color: #800000"> .pagination .page-next_g </span>{<span style="color: #ff0000"> background-position</span>:<span style="color: #0000ff"> -0px -19px</span>;<span style="color: #ff0000"> padding-right</span>:<span style="color: #0000ff"> 16px</span>;<span style="color: #ff0000"> color</span>:<span style="color: #0000ff">#cbcbcb</span>;}<span style="color: #800000"> .pagination .page-cur </span>{<span style="color: #ff0000">background-color</span>:<span style="color: #0000ff"> #f95f9d</span>;<span style="color: #ff0000"> border</span>:<span style="color: #0000ff"> 1px solid #ed3d83</span>;<span style="color: #ff0000">color</span>:<span style="color: #0000ff"> #fff</span>;<span style="color: #ff0000">font-weight</span>:<span style="color: #0000ff"> bold</span>;}<span style="color: #800000"> .pagination .page-break </span>{<span style="color: #ff0000">border</span>:<span style="color: #0000ff"> medium none</span>;<span style="color: #ff0000"> background</span>:<span style="color: #0000ff">none transparent</span>;<span style="color: #ff0000"> color</span>:<span style="color: #0000ff">#333</span>;}<span style="color: #800000"> --> </span>
<span style="color: #008000">//</span><span style="color: #008000">php调用 </span> <span style="color: #800080">$pageNo</span> = <span style="color: #800080">$_GET</span>['pageNo'<span style="color: #000000">]; </span><span style="color: #0000ff">if</span>(<span style="color: #0000ff">empty</span>(<span style="color: #800080">$pageNo</span><span style="color: #000000">)){ </span><span style="color: #800080">$pageNo</span> = 1<span style="color: #000000">; } </span><span style="color: #008000">//</span><span style="color: #008000">分页数据</span> <span style="color: #800080">$pageData</span> = News::getNewsPage(<span style="color: #800080">$pageNo</span>,<span style="color: #800080">$pageSize</span><span style="color: #000000">); </span><span style="color: #008000">//</span><span style="color: #008000">取得总行数</span> <span style="color: #800080">$count</span> = News::<span style="color: #000000">getNewsCount(); </span><span style="color: #008000">//</span><span style="color: #008000">创建分页器</span> <span style="color: #800080">$p</span> = <span style="color: #0000ff">new</span> PageView(<span style="color: #800080">$count</span>['0']['TOTAL'],<span style="color: #800080">$pageSize</span>,<span style="color: #800080">$pageNo</span>,<span style="color: #800080">$pageData</span><span style="color: #000000">); </span><span style="color: #008000">//</span><span style="color: #008000">生成页码</span> <span style="color: #800080">$pageViewString</span> = <span style="color: #800080">$p</span>->echoPageAsDiv();


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JWT est une norme ouverte basée sur JSON, utilisée pour transmettre en toute sécurité des informations entre les parties, principalement pour l'authentification de l'identité et l'échange d'informations. 1. JWT se compose de trois parties: en-tête, charge utile et signature. 2. Le principe de travail de JWT comprend trois étapes: la génération de JWT, la vérification de la charge utile JWT et l'analyse. 3. Lorsque vous utilisez JWT pour l'authentification en PHP, JWT peut être généré et vérifié, et les informations sur le rôle et l'autorisation des utilisateurs peuvent être incluses dans l'utilisation avancée. 4. Les erreurs courantes incluent une défaillance de vérification de signature, l'expiration des jetons et la charge utile surdimensionnée. Les compétences de débogage incluent l'utilisation des outils de débogage et de l'exploitation forestière. 5. L'optimisation des performances et les meilleures pratiques incluent l'utilisation des algorithmes de signature appropriés, la définition des périodes de validité raisonnablement,

Ce tutoriel montre comment traiter efficacement les documents XML à l'aide de PHP. XML (Language de balisage extensible) est un langage de balisage basé sur le texte polyvalent conçu à la fois pour la lisibilité humaine et l'analyse de la machine. Il est couramment utilisé pour le stockage de données et

Une chaîne est une séquence de caractères, y compris des lettres, des nombres et des symboles. Ce tutoriel apprendra à calculer le nombre de voyelles dans une chaîne donnée en PHP en utilisant différentes méthodes. Les voyelles en anglais sont a, e, i, o, u, et elles peuvent être en majuscules ou en minuscules. Qu'est-ce qu'une voyelle? Les voyelles sont des caractères alphabétiques qui représentent une prononciation spécifique. Il y a cinq voyelles en anglais, y compris les majuscules et les minuscules: a, e, i, o, u Exemple 1 Entrée: String = "TutorialSpoint" Sortie: 6 expliquer Les voyelles dans la chaîne "TutorialSpoint" sont u, o, i, a, o, i. Il y a 6 yuans au total

Liaison statique (statique: :) implémente la liaison statique tardive (LSB) dans PHP, permettant à des classes d'appel d'être référencées dans des contextes statiques plutôt que de définir des classes. 1) Le processus d'analyse est effectué au moment de l'exécution, 2) Recherchez la classe d'appel dans la relation de succession, 3) il peut apporter des frais généraux de performance.

Quelles sont les méthodes magiques de PHP? Les méthodes magiques de PHP incluent: 1. \ _ \ _ Construct, utilisé pour initialiser les objets; 2. \ _ \ _ Destruct, utilisé pour nettoyer les ressources; 3. \ _ \ _ Appel, gérer les appels de méthode inexistants; 4. \ _ \ _ GET, Implémentez l'accès à l'attribut dynamique; 5. \ _ \ _ SET, Implémentez les paramètres d'attribut dynamique. Ces méthodes sont automatiquement appelées dans certaines situations, améliorant la flexibilité et l'efficacité du code.

Dans PHP8, les expressions de correspondance sont une nouvelle structure de contrôle qui renvoie différents résultats en fonction de la valeur de l'expression. 1) Il est similaire à une instruction Switch, mais renvoie une valeur au lieu d'un bloc d'instruction d'exécution. 2) L'expression de correspondance est strictement comparée (===), ce qui améliore la sécurité. 3) Il évite les éventuelles omissions de rupture dans les instructions de commutation et améliore la simplicité et la lisibilité du code.
