How to check if string contains specific word in PHP

Written by Rahul, Updated on June 25, 2019

This tutorial will help you to check if a string contains any substring in PHP programming language. For example, you want to run a specific line of code only if an input string contains another substring in it.

Here is a sample PHP programme, which will evaluate to true because the main string $str contains the substring ‘TecAdmin‘ in it. This will print “true”.

<?php
$str = 'Welcome to Tecadmin';

if (strpos($str, 'Tecadmin') !== false) {
    echo 'true';
}
?>

<?php

$str = 'Welcome to Tecadmin';

if (strpos($str, 'Tecadmin') !== false) {

echo 'true';

}

Another PHP program will evaluate to false because the main string $str doesn’t contains the substring ‘Hello‘ in it. This will nothing print.

<?php
$str = 'Welcome to Tecadmin';
$substr = "Hello";

if (strpos($str, $substr) !== false) {
    echo 'true';
}
?>

<?php

$str = 'Welcome to Tecadmin';

$substr = "Hello";

if (strpos($str, $substr) !== false) {

echo 'true';

}

Rahul

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