check string in php

PHP
if (strpos($string, 'substring') !== false) {
	// do stuff 
}if (strpos($haystack,$needle) !== false) {
    echo "$haystack contains $needle";
}$a = 'How are you?';

if (strpos($a, 'are') !== false) {
    echo 'true';
}
is_string($var)$haystack = 'This is my haystack that we shall check'
$has_A = strpos($haystack, 'A') !== false;
$has_a = strpos($haystack, 'a') !== false;
str_contains('STRING', 'SUB_STRING');
Source

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