PHP dynamically generates random images of a specified size

The example in this paper describes how PHP dynamically generates random images of a specified size. Share to everyone for your reference, as follows:

<?php$image_width = +, $image _height = +, $image _str = ", if (Isset ($_get[' W '])) {$image _width = intval ($_get[' W ']) ;} if (Isset ($_get[' h '))) {$image _height = intval ($_get[' h ']);} if (Isset ($_get[' s ')) {$image _str = $_get[' s '];} $img = Imagecreate ($image _width, $image _height); $color = Imagecolorallocate ($img, Mt_rand (157,255), Mt_rand (157,255), Mt_rand (157,255)) Imagefilledrectangle ($img, 0, $image _height, $image _width, 0, $color); $step = Mt_rand ($start) = Mt_rand (0, $step); $color = Imagecolorallocate ($img, Mt_rand (200,255), Mt_rand (200,255), Mt_rand (200,255)); Imagesetthickness ($img, Mt_rand (3)), if ($image _height > $image _width) {for ($i = $start; $i < $image _height * 2; $i  + = $step) {imageline ($img, 0, $i, $i, 0, $color);  }}else{for ($i = $start; $i < $image _width * 2; $i + = $step) {imageline ($img, $i, 0, 0, $i, $color);  }}if ($image _str! = ") {$black = imagecolorallocate ($img, 0, 0, 0); Imagestring ($img, 5, 5, $image _str, $black);} Header (' Content-tyPe:image/png '); Imagepng ($img); Imagedestroy ($img); 

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