Tutorial Crop Image

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Displays a selected chunk of an image. In the example provided, the upper left 100px x 100px are shown.

<?php

$filename= "test.jpg";
list($w, $h, $type, $attr) = getimagesize($filename);
$src_im = imagecreatefromjpeg($filename);

$src_x = '0';   // begin x
$src_y = '0';   // begin y
$src_w = '100'; // width
$src_h = '100'; // height
$dst_x = '0';   // destination x
$dst_y = '0';   // destination y

$dst_im = imagecreatetruecolor($src_w, $src_h);
$white = imagecolorallocate($dst_im, 255, 255, 255);
imagefill($dst_im, 0, 0, $white);

imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h);

header("Content-type: image/png");
imagepng($dst_im);
imagedestroy($dst_im);

?>

Tutorial Create URL Slug from Post Title

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Regular expression function that replaces spaces between words with hyphens.

<?php
function create_slug($string){
   $slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string);
   return $slug;
}
echo create_slug('does this thing work or not');
//returns 'does-this-thing-work-or-not'
?>

Tutorial Create Unique AlphaNumeric

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function MakeUnique($length=16) {
           $salt       = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
           $len        = strlen($salt);
           $makepass   = '';
           mt_srand(10000000*(double)microtime());
           for ($i = 0; $i < $length; $i++) {
               $makepass .= $salt[mt_rand(0,$len - 1)];
           }
       return $makepass;
}

Tutorial Create Data URI’s

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These can be useful for embedding images into HTML/CSS/JS to save on HTTP requests, at the cost of maintainability. More information. There are online tools to do it, but if you want your own very simple utility, here's some PHP to do it:

function data_uri($file, $mime) {
  $contents=file_get_contents($file);
  $base64=base64_encode($contents);
  echo "data:$mime;base64,$base64";
}

Tutorial Count Script Excecution Time

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$execution_time = microtime(); # Start counting

# Your code

$execution_time = microtime() - $execution_time;
$execution_time = sprintf('It took %.5f sec', $execution_time);

Tutorial Convert HEX to RGB

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Give function hex code (e.g. #eeeeee), returns array of RGB values.

function hex2rgb( $colour ) {
        if ( $colour[0] == '#' ) {
                $colour = substr( $colour, 1 );
        }
        if ( strlen( $colour ) == 6 ) {
                list( $r, $g, $b ) = array( $colour[0] . $colour[1], $colour[2] . $colour[3], $colour[4] . $colour[5] );
        } elseif ( strlen( $colour ) == 3 ) {
                list( $r, $g, $b ) = array( $colour[0] . $colour[0], $colour[1] . $colour[1], $colour[2] . $colour[2] );
        } else {
                return false;
        }
        $r = hexdec( $r );
        $g = hexdec( $g );
        $b = hexdec( $b );
        return array( 'red' => $r, 'green' => $g, 'blue' => $b );
}

Tutorial Convert Comma Separated String into Array

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Easy way to turn a CSV file into a parseable array.

<?php
$str="foo,bar,baz,bat";
$arr=explode(",",$str);
// print_r($arr);
?>