check if a string contains a substring php

1$myString = 'Hello Bob how are you?';
2if (strpos($myString, 'Bob') !== false) {
3    echo "My string contains Bob";
4}

1$a = 'How are you?';
2
3if (strpos($a, 'are') !== false) {
4    echo 'true';
5}
6

1if (strpos($string, 'substring') !== false) {
2	// do stuff 
3}

1$a = 'How are you?';
2
3if (strpos($a, 'are') !== false) {
4    echo 'true';
5}

1$result = strpos("haystack", "needle");
2
3if ($result != false)
4{
5  // text found
6}

1$mystring = 'abc';
2$findme   = 'a';
3$pos = strpos($mystring, $findme);