Php interview questions_PHP tutorial-PHP Tutorial-php.cn

Php interview questions_PHP tutorial

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Release： 2016-07-14 10:12:03

Original

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1. Calculate relative path

 function getpathinfo( $a, $b ) { 
    $a2array    = explode(&#39;/&#39;, $a); 
    $b2array    = explode(&#39;/&#39;, $b); 
    $pathinfo   = &#39;&#39;; 
    for( $i = 1; $i <= count($b2array)-2; $i++ ) { 
        $pathinfo.=$a2array[$i] == $b2array[$i] ? &#39;../&#39; : $b2array[$i].&#39;/&#39;; 
    } 
    print_R($pathinfo); 
} 
//计算出 c.php相对于e.php的相对路径应该是../../12/34  
$a          = &#39;/a/b/c/d/e.php&#39;; 
$b          = &#39;/a/b/12/34/c.php&#39;; 
getpathinfo($a, $b); 
?> 

function getpathinfo( $a, $b ) {
    $a2array    = explode(&#39;/&#39;, $a);
    $b2array    = explode(&#39;/&#39;, $b);
    $pathinfo   = &#39;&#39;;
    for( $i = 1; $i <= count($b2array)-2; $i++ ) {
        $pathinfo.=$a2array[$i] == $b2array[$i] ? &#39;../&#39; : $b2array[$i].&#39;/&#39;;
    }
    print_R($pathinfo);
}
//计算出 c.php相对于e.php的相对路径应该是../../12/34
$a          = &#39;/a/b/c/d/e.php&#39;;
$b          = &#39;/a/b/12/34/c.php&#39;;
getpathinfo($a, $b);
?>

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2. Paging principle

 SELECT * FROM table &hellip;&hellip; limit   开始位置 ， 操作条数  分页原理 
分页公式： 
（当前页数 - 1 ）X 每页条数 ， 每页条数 
Select * from table limit ($Page- 1) * $PageSize, $PageSize 

SELECT * FROM table &hellip;&hellip; limit   开始位置 ， 操作条数  分页原理
分页公式：
（当前页数 - 1 ）X 每页条数 ， 每页条数
Select * from table limit ($Page- 1) * $PageSize, $PageSize

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3. Determine whether it is post or get

 $_SERVER[&#39;REQUEST_METHOD&#39;] == &#39;POST&#39; 

$_SERVER[&#39;REQUEST_METHOD&#39;] == &#39;POST&#39;

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