PHP缩略图处理类
<?php
/**
* 缩略图处理类
*
* author: silvester sf.beyond@gmail.comhttp://www.cnblogs.com/silvester
*/
class Songfeng_Image_Ratio {
/**
* 图片大小比例调整
*
* @param $filename 图片路径
* @param $w 目标宽度
* @param $h 目标高度
* @param $override 是否覆盖原文件
* @param $background是否产生背景, 如果要求产生背景则产生图像是指定的大小， 图片内容居中
* @param $color 背影色
*/
public function RatioAdjuct($filename = '', $w = 440, $h = 300, $override = null, $background = null, $color = '0xFFFFFF') {
list ( $imgWidth, $imgHeight ) = getImageSize ( $filename );
$ratioX = $imgWidth / $w;
$ratioY = $imgHeight / $h;
if ($ratioX > $ratioY || $ratioX == $ratioY) {
$dst_w = $w;
$dst_h = ceil ( $imgHeight / $ratioX );
} else if ($ratioY > $ratioX) {
$dst_h = $h;
$dst_w = ceil ( $imgWidth / $ratioY );
}
//判断图片类型
switch (strtolower ( strrchr ( $filename, '.' ) )) {
case '.jpg' :
case '.jpeg' :
$im = imageCreateFromJpeg ( $filename );
break;
case '.gif' :
$im = imageCreateFromGif ( $filename );
break;
case '.png' :
$im = imageCreateFromPng ( $filename );
}
//是否有背景色
if (null !== $background) {
//将背景色转换为十进制的红绿蓝值
$dec = hexdec ( $color );
$red = 0xFF & ($dec >> 0x10);
$green = 0xFF & ($dec >> 0x8);
$blue = 0xFF & $dec;
//居中定位并复制
$dst_pos = array ('d_x' => 0, 'd_y' => 0 );
($dst_w == $w) ? ($dst_pos ['d_y'] = (($h - $dst_h) / 2)) : ($dst_pos ['d_x'] = (($w - $dst_w) / 2));
$imBox = imageCreateTrueColor ( $w, $h );
$color_bg = imageColorAllocate ( $imBox, $red, $green, $blue );
imageFill ( $imBox, 0, 0, $color_bg );
imageCopyResized ( $imBox, $im, $dst_pos ['d_x'], $dst_pos ['d_y'], 0, 0, $dst_w, $dst_h, $imgWidth, $imgHeight );
} else {
$imBox = imageCreateTrueColor ( $dst_w, $dst_h );
imageCopyResized ( $imBox, $im, 0, 0, 0, 0, $dst_w, $dst_h, $imgWidth, $imgHeight );
}
//不替换源图片
if (null === $override)
$filename = str_replace ( strrchr ( $filename, '.' ), '', $filename ) . '_thumb.png';
return imagejpeg ( $imBox, $filename ) ? $filename : false;
}
}
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