PHP and Javascript – Check Substring in String

April 6, 2018 7:21 pm by ATS Staff

Following php code checks to find substring in string:

1. Simple Case

<?php 
$a = 'How are you?';
if (strpos($a, 'are') !== false) {
    echo 'true';
}
?>

2. Check if a string contains a word from an array

function match_found($needles, $haystack) {
    foreach($needles as $needle) {
        if (strpos($haystack, $needle) !== false) {
            return true;
        }
    }
    return false;
}

// Test
$needles = array('computer','phone');
$haystack = 'I have a phone';
if(match_found($needles, $haystack)){
   echo "Match found.";
}

3. Check if a string contains all words in an array

function match_all_found($needles, $haystack) {
    if(empty($needles)) {
        return false;
    }

    foreach($needles as $needle) {
        if (strpos($haystack, $needle) == false) {
            return false;
        }
    }
    return true;
}

// Test
$needles = array('computer','phone');
$haystack = 'I have a computer and a phone';
if(match_all_found($needles, $haystack)){
   echo "Match(es) found.";
}

Javascript:

var str = "foo";
var sub = "oo";

if (str.search(sub) != -1) {
    console.log(true);
}
else {
	  console.log(false);
}