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Home PHP PHP Check If A String Contains Something

PHP Check If A String Contains Something

We can use the PHP built in function strpos to determine if a string contains specific word(s).

For example, we can detect if the IP address of the current user is in the accepted IP list as below:

<?php
	$ip_address = $_SERVER['REMOTE_ADDR'];
 
	$allow_ips = "127.0.0.1;1.54.115.234";
 
	if (strpos($allow_ips, $ip_address) !== FALSE)
		echo 'Okay, pass';
	else
		echo "sorry!";
?>

<?php $ip_address = $_SERVER['REMOTE_ADDR']; $allow_ips = "127.0.0.1;1.54.115.234"; if (strpos($allow_ips, $ip_address) !== FALSE) echo 'Okay, pass'; else echo "sorry!"; ?>

Sep 11, 2013Hoan Huynh
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Hoan Huynh

Hoan Huynh is the founder and head of 4rapiddev.com. Reach him at [email protected]

7 years ago PHPREMOTE_ADDR, strpos123
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