X
HOME HTML CSS JAVASCRIPT SQL PHP JQUERY ANGULAR BOOTSTRAP XML ASP.NET MORE...
REFERENCES | EXAMPLES | FORUM | ABOUT

PHP FILTER_CALLBACK Filter


PHP Filter Reference Complete PHP Filter Reference

Definition and Usage

The FILTER_CALLBACK filter calls a user defined function to filter the value.

This filter gives us full control over the data filtering

The specified functions must be in an associative array with the name "options". See example below

  • Name: "callback"
  • ID-number: 1024

Tips and Notes

Tip: You can create your own user defined function or use an existing PHP function


Example 1

Using a user defined function:

<?php
function convertSpace($string)
  {
  return str_replace(" ", "_", $string);
  }

$string = "Peter is a great guy!";

echo filter_var($string, FILTER_CALLBACK,
array("options"=>"convertSpace"));
?>

The output of the code will be:

Peter_is_a_great_guy!


Example 2

Using an existing PHP function

<?php
$string="Peter is a great guy!";

echo filter_var($string, FILTER_CALLBACK,
array("options"=>"strtoupper"));
?>

The output of the code will be:

PETER IS A GREAT GUY!


PHP Filter Reference Complete PHP Filter Reference

Your suggestion:

Close [X]

Thank You For Helping Us!

Your message has been sent to W3Schools.

Close [X]
Search w3schools.com:

WEB HOSTING

UK Reseller Hosting

WEB BUILDING

Download XML Editor FREE Website BUILDER Free HTML5 Templates

SHARE THIS PAGE

facebook