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# 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 only public properties of objects will be returned in the output. var_export() and print_r() will also return protected and private properties.

> 心得: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)。

示範 1.var_dump() example
`<?php $a = array (1, 2, array ("a", "b", "c")); var_dump($a); ?>`
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); ?>`
output:
    float(3.1)
    bool(true)

See also var_export() and print_r().

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