Replacing a Substring in PHP


How To Replace a Substring in a Given String?



If you know the position of a substring in a given string, you can replace that substring by another string by using the substr_replace() function. Here is a PHP script on how to use substr_replace():

$string = "Warning: System will shutdown in NN minutes!";
$pos = strpos($string, "NN");
print(substr_replace($string, "15", $pos, 2)."\n");
print(substr_replace($string, "5", $pos, 2)."\n");

This script will print:

Warning: System will shutdown in 15 minutes!
(10 minutes later)
Warning: System will shutdown in 5 minutes!

Like substr(), substr_replace() can take negative starting position counted from the end of the string.


PHP Built-in Functions for Strings

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2016-10-13, 315👍, 0💬