$intPos = strpos($strHaystack,$strNeedle);

if( $intPos === false ) {
     // string strNeedle NOT found in strHaystack
} else {
     // string strNeedle found in strHaystack
}

$intPos = strpos($strHaystack,$strNeedle);

if( $pos === false ) {
     // string strNeedle NOT found in strHaystack
} else {
     // string strNeedle found in strHaystack
}

http://www.maxi-pedia.com/string+contains+substring+PHP

Once in a while we need to check whether a string contains substring, some other string or characters or a value. Checking for existence of a string (or substring) inside another string is easier than it might seem. The following article describes how to check for whether a string contains string in PHP, or simply said how to find string within string in PHP.

PHP - How to check if string contains substring PHP

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