PHP Introduction | Functions | var_dump - Output Variable Information

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var_dump is a function that outputs information about variables. It is available in PHP 4 and later.

Syntax

var_dump( $var1, $var2, … );

  • Return value
    • Does not return a value.
  • Interpretation
    • int(1): An integer whose value is 1.
    • float(1.1): A floating-point number whose value is 1.1.
    • string(5) “hello”: A string consisting of 5 characters, with the value hello.
    • array(2) { [0]=> int(1) [1]=> float(1.1) }: An array with 2 values; the first value is integer 1, and the second value is floating-point number 1.1.
    • bool(true): A Boolean whose value is true.

Example

<!DOCTYPE html>
<html lang="ko">
  <head>
    <meta charset="utf-8">
    <title>PHP</title>
    <style>
      body {
        line-height: 2;
        font-family: "Consolas", monospace;
        font-style: italic;
        font-size: 20px;
      }
    </style>
  </head>
  <body>
    <?php
      $a = 1;
      var_dump( $a );
      echo "<br>";
      $b = 1.1;
      var_dump( $b );
      echo "<br>";
      $c = "hello";
      var_dump( $c );
      echo "<br>";
      $d = array( $a, $b );
      var_dump( $d );
      echo "<br>";
      $e = true;
      var_dump( $e );
    ?>
  </body>
</html>