PHP Snippets
« 1 2 3 4 5 »image_inverse
Information
(PHP Version >= 4.0.6)Functions used in this snippet: imagesx, imagesy, imagecreatetruecolor, imagecolorat, imagesetpixel, imagecolorallocate.
Description
int image_inverse( int img )
Makes the image img have all of its colors inversed.
*Note: This is a fairly slow function so it would be best to do it once and save the file for multiple viewings.
Snippet
<?php
function image_inverse($img){
$x = imagesx($img);
$y = imagesy($img);
$dest = imagecreatetruecolor($x, $y);
for($i=0; $i<$x; $i++){
for($j=0; $j<$y; $j++){
$rgb = imagecolorat($img, $i, $j);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
imagesetpixel($dest, $i, $j, imagecolorallocate($dest, (255 - $r), (255 - $g), (255 - $b)));
}
}
return $dest;
}
?>
Example
image_inverse Can be used in the following way:
<?php
$img = imagecreatefromjpeg('someimage.jpg'); // create image
$img = image_inverse($img); // inverses image
header('Content-type: image/jpeg'); // send header
imagejpeg($img); // output image to browser
?>
Updated on Aug 3rd at 4 am.
rotate_image
Information
(PHP Version >= 3)Functions used in this snippet: imagerotate.
Description
int rotate_image( int img[, int degrees[, bool cw]] )
Uses the image img and rotates it according to degrees clockwise. If cw is set to false the function rotates the images in a counter clockwise motion.
Snippet
<?php
function rotate_image($img, $degrees='90', $cw=true){
$degrees = $cw ? $degrees : (360 - $degrees);
switch($degrees){
case '90':
$img = imagerotate($img, 90, 0);
break;
case '180':
$img = imagerotate($img, 180, 0);
break;
case '270':
$img = imagerotate($img, 270, 0);
break;
}
return $img;
}
?>
Example
rotate_image Can be used in the following way:
<?php
$img = imagecreatefromjpeg('somefile.jpg'); // load image
$img = rorate_image($img); // rotates it 90 clockwise
$img = rotate_image($img, 180); // rotates it 180 clockwise
$img = rotate_image($img, 90, false); // rotates it 90 counter clockwise
header('Content-type: image/jpeg'); // set header
imagejpeg($img); // send image to browser
?>
image_flip
Information
(PHP Version >= 4.0.6)Functions used in this snippet: imagesx, imagesy, imagecreatetruecolor, imagecopy, imagedestroy.
Description
int image_flip( int img[, str type] )
Flips the image img to the direction of type
Snippet
<?php
function image_flip($img, $type=''){
$width = imagesx($img);
$height = imagesy($img);
$dest = imagecreatetruecolor($width, $height);
switch($type){
case '':
return $img;
break;
case 'vert':
for($i=0;$i<$height;$i++){
imagecopy($dest, $img, 0, ($height - $i - 1), 0, $i, $width, 1);
}
break;
case 'horiz':
for($i=0;$i<$width;$i++){
imagecopy($dest, $img, ($width - $i - 1), 0, $i, 0, 1, $height);
}
break;
case 'both':
for($i=0;$i<$width;$i++){
imagecopy($dest, $img, ($width - $i - 1), 0, $i, 0, 1, $height);
}
$buffer = imagecreatetruecolor($width, 1);
for($i=0;$i<($height/2);$i++){
imagecopy($buffer, $dest, 0, 0, 0, ($height - $i -1), $width, 1);
imagecopy($dest, $dest, 0, ($height - $i - 1), 0, $i, $width, 1);
imagecopy($dest, $buffer, 0, $i, 0, 0, $width, 1);
}
imagedestroy($buffer);
break;
}
return $dest;
}
?>
Example
image_flip Can be used in the following way:
<?php
$img = imagecreatefromjpeg('somefile.jpg'); // create an image
$img = image_flip($img, 'vert'); // flips image vertically
$img = image_flip($img, 'horiz'); // flips image horizontally
$img = image_flip($img, 'both'); // flips image both ways
header('Content-type: image/jpeg'); // send header
imagejpeg($img); // send image to browser
?>
get_ext
Information
(PHP Version >= 3)Functions used in this snippet: substr, strrpos.
Description
str get_ext( str str[, bool ext] )
If ext is left as false, this function returns str with its file extension taken away.
If ext is set to true, only the extension is returned.
Snippet
<?php
function get_ext($str,$ext=false){
if($ext){
return substr($str,strrpos($str,'.')+1);
}
return substr($str,0,strrpos($str,'.'));
}
?>
Example
get_ext Can be used in the following way:
<?php
echo get_ext('somefile.php'); // somefile
echo get_ext('package.zip', true) // zip
?>
parse_links
Information
(PHP Version >= 3.0.9)Functions used in this snippet: ceil, preg_match_all, strlen, substr, preg_match, str_replace, preg_replace.
Description
str parse_links( str str[, int len[, str mid]] )
Adds around any links inside of a area of text. It works with [url], [url=site], and just plain http://site.com.
Snippet
<?php
function parse_links($str, $len=25, $mid='...'){
$left = ceil(0.6666 * $len);
$right = $len - $left;
preg_match_all('/(?<!=|\]|\/)((https?|ftps?|irc):\/\/|' . '(www([0-9]{1,3})?|ftp)\.)([0-9a-z-]{1,25}' . '[0-9a-z]{1}\.)([^\s&\[\{\}\]]+)/ims', $str, $matches);
foreach($matches[0] as $key=>$value){
$temp = $value;
if(strlen($value) > ($len + strlen($mid) + 2)){
$value = substr($value, 0, $left) . $mid . substr($value,(-1 * $right));
}
$temp = !preg_match('/:\/\//', $temp) ? (substr($temp, 0, 3) === 'ftp' ? 'ftp://' . $temp : 'http://' . $temp) : $temp;
$temp = $temp === $matches[0][$key] && $value === $matches[0][$key] ? '' : '=' . $temp;
$str = str_replace($matches[0][$key],'[url' . $temp . ']' . $value . '[/url]', $str);
}
$str = preg_replace('/\[url=(?!http|ftp|irc)/ims', '[url=http://', $str);
$str = preg_replace('/\[url\](.+?)\[\/url\]/ims','<a href="$1" title="$1">$1</a>',$str);
$str = preg_replace('/\[url=(.+?)\](.+?)\[\/url\]/ims', '<a href="$1" title="$1">$2</a>', $str);
return $str;
}
?>
Example
parse_links Can be used in the following way:
<?php
echo parse_links('http://www.site.com');
// <a href="http://www.site.com">http://www.site.com</a>
echo parse_links('www.cropp.in');
// <a href="http://www.cropp.in">www.cropp.in</a>
echo parse_links('ftp://somesite.com');
// <a href="ftp://somesite.com">ftp://somesite.com</a>
echo parse_links('[url]www.cropp.in[/url]');
// <a href="http://www.cropp.in">www.cropp.in</a>
echo parse_links('[url=www.cropp.in]Cropp.in[/url]');
// <a href="http://www.cropp.in">Cropp.in</a>
echo parse_links( 'http://www.somesite.com/with/a/really/long/url/link' );
// <a href="http://www.somesite.com/with/a/really/long/url/link"> http://www.some...url/link</a>
?>
Updated on Jul 6th at 1 am.
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