var_dump
(PHP 3>= 3.0.5, 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 only public, private and protected properties of objects will be
returned in the output.
提示: 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)。
範例 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: |
See also var_export() and
print_r().