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Stripping out non-numeric characters in string in PHP


Non-alphanumeric characters can be remove by using preg_replace() function. This function perform regular expression search and replace. The function preg_replace() searches for string specified by pattern and replaces pattern with replacement if found.

<?php

// string containing non-alphanumeric characters
$str="!@GeeksforGeeks2018?";

// preg_replace function to remove the
// non-alphanumeric characters
$str = preg_replace( '/[\W]/', '', $str);

// print the string
echo($str);
?>

Output

GeeksforGeeks2018

Example 2


<?php

// string containing non-alphanumeric characters
$str="!@GeeksforGeeks2018?";
	
// preg_replace function to remove the
// non-alphanumeric characters
$str = preg_replace( '/[^a-z0-9]/i', '', $str);

// print the string
echo($str);
?>

Output

GeeksforGeeks2018


Conclusion

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