Does String Contain String

str_contains

  if (str_contains($MyString, 'hello'))    //Returns true or false
  {
    echo 'true';
  }

strpos()

strpos ($haystack , $needle , $offset = 0 )

Returns False on no match or first occurrence index (from 0) on match

  if (strpos($MyString, 'hello') !== False)
  {
    echo 'true';
  }

  $char_index = strpos( strtolower($StringToCheck),  strtolower($LookingForString));		//Using strtolower() removes case sensitivity
  if($char_index === false)
  {
    //Not found
  }
  else
  {
    //Found
  }

Does string start with

  if (str_starts_with($StringToCheck, $LookingForString))     //True if it starts with, false otherwise

Does string end with

  if (str_ends_with($StringToCheck, $LookingForString))     //True if it ends with, false otherwise