php 图片缩略图的实现方法，-php手册-php.cn

Table des matières

php 图片缩略图的实现方法，

Maison

php教程

php手册

php 图片缩略图的实现方法，

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 13, 2016 am 08:43 AM

gif jpeg jpg p php 功能图片实现支持方法 de

php 图片缩略图的实现方法，

功能：支持jpg,jpeg,gif,png,bmp图片格式，支持按原图片的比例进行缩放，可以选择在图片缩放的过程中是否需要对图片进行裁切，加入了图片质量控制，可以实现缩略图片质量最高化。完整类的代码如下：

<?<span>php
</span><span>/*</span><span>*
 * 功能：php生成缩略图片的类
 </span><span>*/</span>
 <span>class</span><span> ResizeImage{
  </span><span>public</span> <span>$type</span>;<span>//</span><span>图片类型</span>
  <span>public</span> <span>$width</span>;<span>//</span><span>实际宽度</span>
  <span>public</span> <span>$height</span>;<span>//</span><span>实际高度</span>
  <span>public</span> <span>$resize_width</span>;<span>//</span><span>改变后的宽度</span>
  <span>public</span> <span>$resize_height</span>;<span>//</span><span>改变后的高度</span>
  <span>public</span> <span>$cut</span>;<span>//</span><span>是否裁图</span>
  <span>public</span> <span>$srcimg</span>;<span>//</span><span>源图象 </span>
  <span>public</span> <span>$dstimg</span>;<span>//</span><span>目标图象地址</span>
  <span>public</span> <span>$im</span>;<span>//</span><span>临时创建的图象</span>
  <span>public</span> <span>$quality</span>;<span>//</span><span>图片质量</span>
  <span>function</span> resizeimage(<span>$img</span>,<span>$wid</span>,<span>$hei</span>,<span>$c</span>,<span>$dstpath</span>,<span>$quality</span>=100<span>){
   </span><span>$this</span>->srcimg=<span>$img</span><span>;
   </span><span>$this</span>->resize_width=<span>$wid</span><span>;
   </span><span>$this</span>->resize_height=<span>$hei</span><span>;
   </span><span>$this</span>->cut=<span>$c</span><span>;
   </span><span>$this</span>->quality=<span>$quality</span><span>;
   </span><span>$this</span>->type=<span>strtolower</span>(<span>substr</span>(<span>strrchr</span>(<span>$this</span>->srcimg,'.'),1));<span>//</span><span>图片的类型</span>
   <span>$this</span>->initi_img();<span>//</span><span>初始化图象</span>
   <span>$this</span> -> dst_img(<span>$dstpath</span>);<span>//</span><span>目标图象地址</span>
   @<span>$this</span>->width=imagesx(<span>$this</span>-><span>im);
   @</span><span>$this</span>->height=imagesy(<span>$this</span>-><span>im);
   </span><span>$this</span>->newimg();<span>//</span><span>生成图象</span>
   @ImageDestroy(<span>$this</span>-><span>im);
  }
  </span><span>function</span><span> newimg(){
   </span><span>$resize_ratio</span>=(<span>$this</span>->resize_width)/(<span>$this</span>->resize_height);<span>//</span><span>改变后的图象的比例</span>
   @<span>$ratio</span>=(<span>$this</span>->width)/(<span>$this</span>->height);<span>//</span><span>实际图象的比例</span>
   <span>if</span>((<span>$this</span>->cut)=='1'){<span>//</span><span>裁图</span>
    <span>if</span>(<span>$img_func</span>==='imagepng'&&(<span>str_replace</span>('.','',<span>PHP_VERSION</span>)>=512)){ <span>//</span><span>针对php版本大于5.12参数变化后的处理情况</span>
     <span>$quality</span>=9<span>;
    }
    </span><span>if</span>(<span>$ratio</span>>=<span>$resize_ratio</span>){<span>//</span><span>高度优先</span>
     <span>$newimg</span>=imagecreatetruecolor(<span>$this</span>->resize_width,<span>$this</span>-><span>resize_height);
     imagecopyresampled(</span><span>$newimg</span>,<span>$this</span>->im,0,0,0,0,<span>$this</span>->resize_width,<span>$this</span>->resize_height,((<span>$this</span>->height)*<span>$resize_ratio</span>),<span>$this</span>-><span>height);
     imagejpeg(</span><span>$newimg</span>,<span>$this</span>->dstimg,<span>$this</span>-><span>quality);
    }
    </span><span>if</span>(<span>$ratio</span><<span>$resize_ratio</span>){<span>//</span><span>宽度优先</span>
     <span>$newimg</span>=imagecreatetruecolor(<span>$this</span>->resize_width,<span>$this</span>-><span>resize_height);
     imagecopyresampled(</span><span>$newimg</span>,<span>$this</span>->im,0,0,0,0,<span>$this</span>->resize_width,<span>$this</span>->resize_height,<span>$this</span>->width,((<span>$this</span>->width)/<span>$resize_ratio</span><span>));
     imagejpeg(</span><span>$newimg</span>,<span>$this</span>->dstimg,<span>$this</span>-><span>quality);
    }
   }</span><span>else</span>{<span>//</span><span>不裁图</span>
    <span>if</span>(<span>$ratio</span>>=<span>$resize_ratio</span><span>){
     </span><span>$newimg</span>=imagecreatetruecolor(<span>$this</span>->resize_width,(<span>$this</span>->resize_width)/<span>$ratio</span><span>);
     imagecopyresampled(</span><span>$newimg</span>,<span>$this</span>->im,0,0,0,0,<span>$this</span>->resize_width,(<span>$this</span>->resize_width)/<span>$ratio</span>,<span>$this</span>->width,<span>$this</span>-><span>height);
     imagejpeg(</span><span>$newimg</span>,<span>$this</span>->dstimg,<span>$this</span>-><span>quality);
    }
    </span><span>if</span>(<span>$ratio</span><<span>$resize_ratio</span><span>){
     @</span><span>$newimg</span>=imagecreatetruecolor((<span>$this</span>->resize_height)*<span>$ratio</span>,<span>$this</span>-><span>resize_height);
     @imagecopyresampled(</span><span>$newimg</span>,<span>$this</span>->im,0,0,0,0,(<span>$this</span>->resize_height)*<span>$ratio</span>,<span>$this</span>->resize_height,<span>$this</span>->width,<span>$this</span>-><span>height);
     @imagejpeg(</span><span>$newimg</span>,<span>$this</span>->dstimg,<span>$this</span>-><span>quality);
    }
   }
  }
  </span><span>function</span> initi_img(){<span>//</span><span>初始化图象</span>
   <span>if</span>(<span>$this</span>->type=='jpg' || <span>$this</span>->type=='jpeg'<span>){
    </span><span>$this</span>->im=imagecreatefromjpeg(<span>$this</span>-><span>srcimg);
   }
   </span><span>if</span>(<span>$this</span>->type=='gif'<span>){
    </span><span>$this</span>->im=imagecreatefromgif(<span>$this</span>-><span>srcimg);
   }
   </span><span>if</span>(<span>$this</span>->type=='png'<span>){
    </span><span>$this</span>->im=imagecreatefrompng(<span>$this</span>-><span>srcimg);
   }
   </span><span>if</span>(<span>$this</span>->type=='wbm'<span>){
    @</span><span>$this</span>->im=imagecreatefromwbmp(<span>$this</span>-><span>srcimg);
   }
   </span><span>if</span>(<span>$this</span>->type=='bmp'<span>){
    </span><span>$this</span>->im=<span>$this</span>->ImageCreateFromBMP(<span>$this</span>-><span>srcimg);
   }
  }
  </span><span>function</span> dst_img(<span>$dstpath</span>){<span>//</span><span>图象目标地址</span>
   <span>$full_length</span>=<span>strlen</span>(<span>$this</span>-><span>srcimg);
   </span><span>$type_length</span>=<span>strlen</span>(<span>$this</span>-><span>type);
   </span><span>$name_length</span>=<span>$full_length</span>-<span>$type_length</span><span>;
   </span><span>$name</span>=<span>substr</span>(<span>$this</span>->srcimg,0,<span>$name_length</span>-1<span>);
   </span><span>$this</span>->dstimg=<span>$dstpath</span><span>;
   </span><span>//</span><span>echo $this->dstimg;</span>
<span>  }
    
  </span><span>function</span> ImageCreateFromBMP(<span>$filename</span>){ <span>//</span><span>自定义函数处理bmp图片</span>
   <span>if</span>(!<span>$f1</span>=<span>fopen</span>(<span>$filename</span>,"rb"<span>))returnFALSE;
   </span><span>$FILE</span>=<span>unpack</span>("vfile_type/Vfile_size/Vreserved/Vbitmap_offset",<span>fread</span>(<span>$f1</span>,14<span>));
   </span><span>if</span>(<span>$FILE</span>['file_type']!=19778<span>)returnFALSE;
   </span><span>$BMP</span>=<span>unpack</span>('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
     '/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
     '/Vvert_resolution/Vcolors_used/Vcolors_important',<span>fread</span>(<span>$f1</span>,40<span>));
   </span><span>$BMP</span>['colors']=<span>pow</span>(2,<span>$BMP</span>['bits_per_pixel'<span>]);
   </span><span>if</span>(<span>$BMP</span>['size_bitmap']==0)<span>$BMP</span>['size_bitmap']=<span>$FILE</span>['file_size']-<span>$FILE</span>['bitmap_offset'<span>];
   </span><span>$BMP</span>['bytes_per_pixel']=<span>$BMP</span>['bits_per_pixel']/8<span>;
   </span><span>$BMP</span>['bytes_per_pixel2']=<span>ceil</span>(<span>$BMP</span>['bytes_per_pixel'<span>]);
   </span><span>$BMP</span>['decal']=(<span>$BMP</span>['width']*<span>$BMP</span>['bytes_per_pixel']/4<span>);
   </span><span>$BMP</span>['decal']-=<span>floor</span>(<span>$BMP</span>['width']*<span>$BMP</span>['bytes_per_pixel']/4<span>);
   </span><span>$BMP</span>['decal']=4-(4*<span>$BMP</span>['decal'<span>]);
   </span><span>if</span>(<span>$BMP</span>['decal']==4)<span>$BMP</span>['decal']=0<span>;
   </span><span>$PALETTE</span>=<span>array</span><span>();
   </span><span>if</span>(<span>$BMP</span>['colors']<16777216<span>)
   {
    </span><span>$PALETTE</span>=<span>unpack</span>('V'.<span>$BMP</span>['colors'],<span>fread</span>(<span>$f1</span>,<span>$BMP</span>['colors']*4<span>));
   }
   </span><span>$IMG</span>=<span>fread</span>(<span>$f1</span>,<span>$BMP</span>['size_bitmap'<span>]);
   </span><span>$VIDE</span>=<span>chr</span>(0<span>);
   </span><span>$res</span>=imagecreatetruecolor(<span>$BMP</span>['width'],<span>$BMP</span>['height'<span>]);
   </span><span>$P</span>=0<span>;
   </span><span>$Y</span>=<span>$BMP</span>['height']-1<span>;
   </span><span>while</span>(<span>$Y</span>>=0<span>)
   {
    </span><span>$X</span>=0<span>;
    </span><span>while</span>(<span>$X</span><<span>$BMP</span>['width'<span>])
    {
     </span><span>if</span>(<span>$BMP</span>['bits_per_pixel']==24<span>)
      </span><span>$COLOR</span>=<span>unpack</span>("V",<span>substr</span>(<span>$IMG</span>,<span>$P</span>,3).<span>$VIDE</span><span>);
     </span><span>elseif</span>(<span>$BMP</span>['bits_per_pixel']==16<span>)
     {
      </span><span>$COLOR</span>=<span>unpack</span>("n",<span>substr</span>(<span>$IMG</span>,<span>$P</span>,2<span>));
      </span><span>$COLOR</span>[1]=<span>$PALETTE</span>[<span>$COLOR</span>[1]+1<span>];
     }
     </span><span>elseif</span>(<span>$BMP</span>['bits_per_pixel']==8<span>)
     {
      </span><span>$COLOR</span>=<span>unpack</span>("n",<span>$VIDE</span>.<span>substr</span>(<span>$IMG</span>,<span>$P</span>,1<span>));
      </span><span>$COLOR</span>[1]=<span>$PALETTE</span>[<span>$COLOR</span>[1]+1<span>];
     }
     </span><span>elseif</span>(<span>$BMP</span>['bits_per_pixel']==4<span>)
     {
      </span><span>$COLOR</span>=<span>unpack</span>("n",<span>$VIDE</span>.<span>substr</span>(<span>$IMG</span>,<span>floor</span>(<span>$P</span>),1<span>));
      </span><span>if</span>((<span>$P</span>*2)%2==0)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]>>4);<span>else</span><span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x0F<span>);
      </span><span>$COLOR</span>[1]=<span>$PALETTE</span>[<span>$COLOR</span>[1]+1<span>];
     }
     </span><span>elseif</span>(<span>$BMP</span>['bits_per_pixel']==1<span>)
     {
      </span><span>$COLOR</span>=<span>unpack</span>("n",<span>$VIDE</span>.<span>substr</span>(<span>$IMG</span>,<span>floor</span>(<span>$P</span>),1<span>));
      </span><span>if</span>((<span>$P</span>*8)%8==0)<span>$COLOR</span>[1]=<span>$COLOR</span>[1]>>7<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==1)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x40)>>6<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==2)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x20)>>5<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==3)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x10)>>4<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==4)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x8)>>3<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==5)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x4)>>2<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==6)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x2)>>1<span>;
      </span><span>elseif</span>((<span>$P</span>*8)%8==7)<span>$COLOR</span>[1]=(<span>$COLOR</span>[1]&0x1<span>);
      </span><span>$COLOR</span>[1]=<span>$PALETTE</span>[<span>$COLOR</span>[1]+1<span>];
     }
     </span><span>else</span><span>
      returnFALSE;
     imagesetpixel(</span><span>$res</span>,<span>$X</span>,<span>$Y</span>,<span>$COLOR</span>[1<span>]);
     </span><span>$X</span>++<span>;
     </span><span>$P</span>+=<span>$BMP</span>['bytes_per_pixel'<span>];
    }
    </span><span>$Y</span>--<span>;
    </span><span>$P</span>+=<span>$BMP</span>['decal'<span>];
   }
   </span><span>fclose</span>(<span>$f1</span><span>);
   </span><span>return</span><span>$res</span><span>;
  }
    
 }
</span>?>

Copier après la connexion

使用方法很简单代码如下：

<span>$resizeimage</span>=<span>new</span> ResizeImage('upload/abc.bmp', '120', '90', '0', 'upload/xabc.bmp');

Copier après la connexion

Outils d'IA chauds

Undresser.AI Undress

Application basée sur l'IA pour créer des photos de nu réalistes

AI Clothes Remover

Outil d'IA en ligne pour supprimer les vêtements des photos.

AI Hentai Generator

Générez AI Hentai gratuitement.

Afficher plus

Article chaud

R.E.P.O. Crystals d'énergie expliqués et ce qu'ils font (cristal jaune)

3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Meilleurs paramètres graphiques

3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Solution d'énigmes de coquille

1 Il y a quelques semaines By DDD

R.E.P.O. Comment réparer l'audio si vous n'entendez personne

3 Il y a quelques semaines By 尊渡假赌尊渡假赌尊渡假赌

Où trouver la courte de la grue à atomide atomique

1 Il y a quelques semaines By DDD

Afficher plus

Outils chauds

Bloc-notes++7.3.1

Éditeur de code facile à utiliser et gratuit

SublimeText3 version chinoise

Version chinoise, très simple à utiliser

Envoyer Studio 13.0.1

Puissant environnement de développement intégré PHP

SublimeText3 version Mac

Logiciel d'édition de code au niveau de Dieu (SublimeText3)

Afficher plus

Sujets chauds

Où se trouve l'entrée de connexion pour la messagerie Gmail ?

7428

Tutoriel CakePHP

1359

Quel est le format du nom de compte de Steam

Clé d&#39;activation Win11 permanent

Afficher plus

Related knowledge

Guide d'installation et de mise à niveau de PHP 8.4 pour Ubuntu et Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 apporte plusieurs nouvelles fonctionnalités, améliorations de sécurité et de performances avec une bonne quantité de dépréciations et de suppressions de fonctionnalités. Ce guide explique comment installer PHP 8.4 ou mettre à niveau vers PHP 8.4 sur Ubuntu, Debian ou leurs dérivés. Bien qu'il soit possible de compiler PHP à partir des sources, son installation à partir d'un référentiel APT comme expliqué ci-dessous est souvent plus rapide et plus sécurisée car ces référentiels fourniront les dernières corrections de bogues et mises à jour de sécurité à l'avenir.

Date et heure de CakePHP Sep 10, 2024 pm 05:27 PM

Pour travailler avec la date et l'heure dans cakephp4, nous allons utiliser la classe FrozenTime disponible.

CakePHP travaillant avec la base de données Sep 10, 2024 pm 05:25 PM

Travailler avec la base de données dans CakePHP est très simple. Nous comprendrons les opérations CRUD (Créer, Lire, Mettre à jour, Supprimer) dans ce chapitre.

Téléchargement de fichiers CakePHP Sep 10, 2024 pm 05:27 PM

Pour travailler sur le téléchargement de fichiers, nous allons utiliser l'assistant de formulaire. Voici un exemple de téléchargement de fichiers.

Discuter de CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP est un framework open source pour PHP. Il vise à faciliter grandement le développement, le déploiement et la maintenance d'applications. CakePHP est basé sur une architecture de type MVC à la fois puissante et facile à appréhender. Modèles, vues et contrôleurs gu

CakePHP créant des validateurs Sep 10, 2024 pm 05:26 PM

Le validateur peut être créé en ajoutant les deux lignes suivantes dans le contrôleur.

Journalisation CakePHP Sep 10, 2024 pm 05:26 PM

Se connecter à CakePHP est une tâche très simple. Il vous suffit d'utiliser une seule fonction. Vous pouvez enregistrer les erreurs, les exceptions, les activités des utilisateurs, les actions entreprises par les utilisateurs, pour tout processus en arrière-plan comme cronjob. La journalisation des données dans CakePHP est facile. La fonction log() est fournie

Comment configurer Visual Studio Code (VS Code) pour le développement PHP Dec 20, 2024 am 11:31 AM

Visual Studio Code, également connu sous le nom de VS Code, est un éditeur de code source gratuit – ou environnement de développement intégré (IDE) – disponible pour tous les principaux systèmes d'exploitation. Avec une large collection d'extensions pour de nombreux langages de programmation, VS Code peut être c

See all articles

php 图片缩略图的实现方法，

php 图片缩略图的实现方法，

Outils d'IA chauds

Undresser.AI Undress

AI Clothes Remover

Undress AI Tool

Clothoff.io

AI Hentai Generator

Article chaud

Outils chauds

Bloc-notes++7.3.1

SublimeText3 version chinoise

Envoyer Studio 13.0.1

Dreamweaver CS6

SublimeText3 version Mac

Sujets chauds