(PHP 5, PHP 7, PHP 8)
strpbrk — Search a string for any of a set of characters
   strpbrk() searches the string
   string for a characters.
  
string
       The string where characters is looked for.
      
charactersThis parameter is case sensitive.
   Returns a string starting from the character found, or false if it is
   not found.
  
Example #1 strpbrk() example
<?php
$text = 'This is a Simple text.';
// this echoes "is is a Simple text." because 'i' is matched first
echo strpbrk($text, 'mi'), PHP_EOL;
// this echoes "Simple text." because chars are case sensitive
echo strpbrk($text, 'S'), PHP_EOL;
?>