35 lines
778 B
PHP
35 lines
778 B
PHP
<?
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/*
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$imgPath 源图片路径
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$maxWidth 缩小后最大宽度
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$maxHeight 缩小后最大高度
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$destPath 目标路径，留空则直接输出
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*/
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function resizeImg($imgPath, $maxWidth, $maxHeight, $destPath = '') {
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$img = imagecreatefromjpeg($imgPath);
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$w = $w_o = imagesx($img);
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$h = $h_o = imagesy($img);
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if($w > $maxWidth) {
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$h = intval($h*$maxWidth/$w);
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$w = $maxWidth;
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}
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if($h > $maxHeight) {
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$w = intval($w*$maxHeight/$h);
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$h = $maxHeight;
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}
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//echo $w.",".$h;exit;
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$img2 = imagecreatetruecolor($w, $h);
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imagecopyresampled($img2, $img, 0, 0, 0, 0, $w, $h, $w_o, $h_o);
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if($destPath) {
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imagejpeg($img2, $destPath, 80);
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} else {
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header("Content-Type:image/jpeg");
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imagejpeg($img2, '', 80);
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}
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imagedestroy($img2);
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imagedestroy($img);
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}
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//resizeImg("1.jpg", 300, 300);
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