var_dump
(PHP 4, PHP 5)
var_dump — Dumps information about a variable
Description
void var_dump
( mixed $expression
[, mixed $expression
[, $...
]] )
This function displays structured information about one or more expressions that includes its type and value. Arrays and objects are explored recursively with values indented to show structure.
In PHP 5 all public, private and protected properties of objects will be returned in the output.
Tip
任何直接把輸出到瀏覽器的結果，可使用輸出控制函數來擷取此函數的輸出，再將之存入一個字串(舉例說明)。
Parameters
- expression
-
The variable you want to export.
Return Values
No value is returned.
範例
Example#1 var_dump() example
<?php
$a = array(1, 2, array("a", "b", "c"));
var_dump($a);
?>
The above example will output:
array(3) { [0]=> int(1) [1]=> int(2) [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } }
<?php
$b = 3.1;
$c = true;
var_dump($b, $c);
?>
The above example will output:
float(3.1) bool(true)