This gist is an answer to the Programming Challenge: "Determine if a String is an int or a double." for a job application.

gistfile1.txt

<?php
function intOrDouble( $str ) {
  
  if ( is_numeric( $str ) ) {
     
    if ( strpos($str, ".") !== false ) {
       
      return 1;
      
    } else {
     
      return 0;
      
    }
     
  } else {
    
    return -1; 
    
  }
  
}

$tests = array( 'test', '2', '004', '6.73', '0.12', 'zero.three' );
$results = array( -1 => 'neither int nor double', 0 => 'int', 1 => 'double' );

echo '<pre>';
print_r( $tests );
echo '</pre>';

foreach ( $tests as $key => $test ) {
  
  echo '$tests[' . $key .'] = ' . $results[ intOrDouble ( $test ) ] .'<br>'; 
  
}