PHP Manual
Prev |  | Next

# var_dump

(PHP 3>= 3.0.5, PHP 4 )

var_dump -- Dumps information about a variable

## Description

void var_dump ( mixed expression [, mixed expression [, ...]])

This function returns structured information about one or more expressions that includes its type and value. Arrays are explored recursively with values indented to show structure.

> Tip: As with anything that outputs its result directly to the browser, you can use the output-control functions to capture the output of this function, and save it in a string (for example).

Compare var_dump() to print_r().

    <pre>
    <?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"
      }
    }

    */

    $b = 3.1;
    $c = TRUE;
    var_dump($b,$c);

    /* output:
    float(3.1)
    bool(true)

    */
    ?>
    </pre>

Prev | Home | Next
unset | Up | var_export