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FILTER_CALLBACK constant in PHP
The FILTER_CALLBACK constant calls a user defined function to filter the value.
Return
The FILTER_CALLBACK constant does not return anything.
Example
The following is an example that converts the case of a string. Here, existing function in PHP is taken.
<?php
$string = "DEMO TEXT!";
echo filter_var($string, FILTER_CALLBACK,array("options" = >"strtolower"));
?>Output
The following is the output.
demo text!
Updated on: 27-Jun-2020
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