DZone Snippets: Goldfish's Code Snippets

indexOf an array element

goldfish () — Sun, 30 Jul 2006 19:15:39 GMT

Finds the first instance of an element ($needle) in an array ($haystack). It works in ascending order (from element 0 to the array's length), can be easily modified to work in reverse if required. Will return either the index of the first occurance of false if hasn't been found.



function indexOf($needle, $haystack) {                // conversion of JavaScripts most awesome

        for ($i=0;$i                if ($haystack[$i] == $needle) {       // a value and returns the index of the *first*

                        return $i;                    // occurance

                }

        }

        return false;

}

Integer to alphanumeric character

goldfish () — Sun, 30 Jul 2006 19:12:18 GMT

A function that converts an integer between 0 and 61 into an alphanumberic character. Ranges from 0-9, A-Z, a-z. Very handy for generating random strings and stuff like that.





function map_char($num) { 

   $int = $num; $int+=48;

   ($int > 57) ? $int += 7 : null;

   ($int > 90) ? $int += 6 : null;

   return chr($int);

}

Reverse switch

goldfish () — Thu, 20 Jul 2006 20:22:41 GMT

Handy technique if you want to use more complex comparisons other than == in a switch statement. Much tidier than the elseif equivilant.



switch(true) {



   case $x == "hello":

      // $x is hello



   case is_numeric($x):

      // $x is a number



   case $x < 10:

      // $x is less than 10

}