gd: do not use or unnecessary reference imagedestroy() (#4396)

Author: pereorga

reference/image/examples.xml

@@ -19,7 +19,6 @@ $orange = imagecolorallocate($im, 220, 210, 60);
 $px     = (imagesx($im) - 7.5 * strlen($string)) / 2;
 imagestring($im, 3, $px, 9, $string, $orange);
 imagepng($im);
-imagedestroy($im);
 
 ?>
 ]]>
@@ -57,10 +56,9 @@ $sy = imagesy($stamp);
 // width to calculate positioning of the stamp. 
 imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));
 
-// Output and free memory
+// Output
 header('Content-type: image/png');
 imagepng($im);
-imagedestroy($im);
 ?>
 ]]>
     </programlisting>
@@ -103,9 +101,8 @@ $sy = imagesy($stamp);
 // Merge the stamp onto our photo with an opacity of 50%
 imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 50);
 
-// Save the image to file and free memory
+// Save the image to file
 imagepng($im, 'photo_stamp.png');
-imagedestroy($im);
 
 ?>
 ]]>

reference/image/functions/image-type-to-extension.xml

@@ -61,7 +61,6 @@ $im = imagecreatetruecolor(100, 100);
 
 // Save image
 imagepng($im, './test' . image_type_to_extension(IMAGETYPE_PNG));
-imagedestroy($im);
 ?>
 ]]>
     </programlisting>

reference/image/functions/image2wbmp.xml

@@ -78,7 +78,6 @@ $image = imagecreatefrompng($file);
 
 header('Content-Type: ' . image_type_to_mime_type(IMAGETYPE_WBMP));
 image2wbmp($image); // output the stream directly
-imagedestroy($image);
 ?>
 ]]>
     </programlisting>

reference/image/functions/imagealphablending.xml

@@ -86,7 +86,6 @@ imagefilledrectangle($im, 30, 30, 70, 70, imagecolorallocate($im, 255, 0, 0));
 header('Content-Type: image/png');
 
 imagepng($im);
-imagedestroy($im);
 ?>
 ]]>
    </programlisting>

reference/image/functions/imageantialias.xml

@@ -105,8 +105,6 @@ imagecopymerge($aa, $normal, 200, 0, 0, 0, 200, 100, 100);
 header('Content-type: image/png');
 
 imagepng($aa);
-imagedestroy($aa);
-imagedestroy($normal);
 ?>
 ]]>
     </programlisting>

reference/image/functions/imagearc.xml

@@ -143,9 +143,6 @@ imagearc($img, 140,  75,  50,  50,  0, 360, $blue);
 header("Content-type: image/png");
 imagepng($img);
 
-// free memory
-imagedestroy($img);
-
 ?>
 ]]>
     </programlisting>

reference/image/functions/imagebmp.xml

@@ -96,9 +96,6 @@ imagestring($im, 1, 5, 5,  'BMP with PHP', $text_color);
 
 // Save the image
 imagebmp($im, 'php.bmp');
-
-// Free up memory
-imagedestroy($im);
 ?>
 ]]>
     </programlisting>

reference/image/functions/imagecolorallocatealpha.xml

@@ -124,7 +124,6 @@ header('Content-Type: image/png');
 
 // and finally, output the result
 imagepng($image);
-imagedestroy($image);
 ?>
 ]]>
    </programlisting>

reference/image/functions/imagecolorclosest.xml

@@ -108,8 +108,6 @@ foreach($colors as $id => $rgb)
 
     echo "#$id: Search ($rgb[0], $rgb[1], $rgb[2]); Closest match: $result.\n";
 }
-
-imagedestroy($im);
 ?>
 ]]>
     </programlisting>

reference/image/functions/imagecolorclosestalpha.xml

@@ -95,8 +95,6 @@ foreach($colors as $id => $rgb)
 
     echo "#$id: Search ($rgb[0], $rgb[1], $rgb[2], $rgb[3]); Closest match: $result.\n";
 }
-
-imagedestroy($im);
 ?>
 ]]>
     </programlisting>