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void var_dump ( mixed $expression [, mixed $... ] ) ------------------------------------------------------------- -------------------------------------------------------------
$array = array(1, 2, array('a', 'b', 'c')); var_export($array); /* 输出: array ( 0 => 1, 1 => 2, 2 => array ( 0 => 'a', 1 => 'b', 2 => 'c', ), ) */ print_r($array); /* 输出: Array ( [0] => 1 [1] => 2 [2] => Array ( [0] => a [1] => b [2] => c ) ) */ var_dump($array); /* 输出: array (size=3) 0 => int 1 1 => int 2 2 => array (size=3) 0 => string 'a' (length=1) 1 => string 'b' (length=1) 2 => string 'c' (length=1) */
下面对比下三者对变量的输出 $var = 'string'; var_dump($var); /* 输出: string 'string' (length=6) */ var_export($var); /* 输出: 'string' */ print_r($var); /* 输出: string */
------------------------------------------------------------- $handle = fopen('log.txt', 'r'); var_dump($handle); /* 输出: resource(3, stream) */ var_export($handle); /* 输出: NULL */ print_r($handle); /* 输出: Resource id #3 */
------------------------------------------------------------- $a = TRUE; var_dump($a); /* 输出: boolean true */ var_export($a); /* 输出: true */ print_r($a); /* 输出: 1 */
------------------------------------------------------------- $obj = new obj(); var_dump($obj); /* 输出: object(b)[1] private 'data' => null */ var_export($obj); /* 输出: obj::__set_state(array( 'data' => NULL, )) */ print_r($obj); /* 输出: obj Object ( [data:obj:private] => ) */
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