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Asked: 2026-05-14T06:56:30+00:00

I want to keep only numbers and remove all characters from a variable. For

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I want to keep only numbers and remove all characters from a variable.

For example:

input: +012-(34).56.(ASD)+:"{}|78*9
output: 0123456789
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1 Answer

  1. Editorial Team

    With Zend_Filter_Digits

    Returns the string $value, removing all but digit characters.

    Example with static call through Zend_Filter:

    echo Zend_Filter::filterStatic('abc-123-def-456', 'Digits'); // 123456

    Example with Digits instance

    $digits = new Zend_Filter_Digits;
echo $digits->filter('abc-123-def-456'); // 123456;

    Internally, the filter will use preg_replace to process the input string. Depending on if the Regex Engine is compiled with UTF8 and Unicode enabled, one of these patterns will be used:

    • [^0-9] – Filter if Unicode is disabled
    • [^[:digit:]] – Filter for the value with mbstring
    • [\p{^N}] – Filter for the value without mbstring

    See http://framework.zend.com/svn/framework/standard/trunk/library/Zend/Filter/Digits.php

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