The example in this article describes the method of dynamically generating random pictures of specified sizes in PHP. Share it with everyone for your reference, the details are as follows:
<?php $image_width = 100; $image_height = 100; $image_str = ''; if (isset($_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(15, 30); $start = mt_rand(0, $step); $color = imagecolorallocate($img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255)); imagesetthickness($img, mt_rand(3, 10)); if ($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, 12, 5, 5, $image_str, $black); } header('Content-type:image/png'); imagepng($img); imagedestroy($img);
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I hope this article will be helpful to everyone in PHP programming.