PHP cyclically determines whether the string contains the array value

Example

The code is as follows:	Copy code
<? Php Function is_exist ($ str, $ key ){ Foreach ($ key as $ v ){ If (strpos ($ str, $ v)>-1 ){ Return true;   }  } Return false; } $ Str = 'abcdefg US China '; $ Key = array ('4', '5', 'A '); If (is_exist ($ str, $ key )){ Echo 'yes '; } Else { Echo 'no '; } ?>

Principle analysis

In a simple example, we only need to use foreach to traverse the array value and then use strpos ($ str, $ v)>-1 to determine whether the array value is specified in the string, if it is found, the return value is greater than or equal to 0.