這篇文章主要介紹了PHP生成縮略圖執行個體講解，文章列舉了執行個體代碼，有正好需要的同學可以借鑒下。
封裝的方法函數：<?php
function createThumbImg($imgSrc, $thumbWidth, $thumbHeight, $thumbSrc, $isCut = false) {
//1.擷取圖檔的類型
$type = substr(strrchr($imgSrc, "."), 1);
//2.初始化圖象
if ($type == "jpg" || $type == "jpeg") {
//建立一塊畫布，并從JPEG檔案或URL位址載入一副圖像
$sourceImg = imagecreatefromjpeg($imgSrc);
}elseif ($type == "gif") {
//建立一塊畫布，并從GIF檔案或URL位址載入一副圖像
$sourceImg = imagecreatefromgif($imgSrc);
}elseif ($type == "png") {
//建立一塊畫布，并從PNG檔案或URL位址載入一副圖像
$sourceImg = imagecreatefrompng($imgSrc);
}elseif ($type == "wbmp") {
//建立一塊畫布，并從WBMP檔案或URL位址載入一副圖像
$sourceImg = imagecreatefromwbmp($imgSrc);
}
//取得圖像寬度
$width = imagesx($sourceImg);
//取得圖像高度
$height = imagesy($sourceImg);
//3.生成圖象
//縮略圖的圖象比例
$scale = ($thumbWidth) / ($thumbHeight);
//源圖檔的圖象比例
$ratio = ($width) / ($height);
if (($isCut) == 1) {
//高度優先
if ($ratio >= $scale) {
//建立真彩圖像資源(imagecreatetruecolor()函數使用GDLibrary建立新的真彩色圖像)
$newimg = imagecreatetruecolor($thumbWidth, $thumbHeight);
//圖像處理
imagecopyresampled($newimg, $sourceImg, 0, 0, 0, 0, $thumbWidth, $thumbHeight, (($height) * $scale), $height);
//以JPEG格式将圖像輸出到浏覽器或檔案
ImageJpeg($newimg, $thumbSrc);
}
//寬度優先
if ($ratio
$newimg = imagecreatetruecolor($thumbWidth, $thumbHeight);
imagecopyresampled($newimg, $sourceImg, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $width, (($width) / $scale));
ImageJpeg($newimg, $thumbSrc);
}
} else {
if ($ratio >= $scale) {
$newimg = imagecreatetruecolor($thumbWidth, ($thumbWidth) / $ratio);
imagecopyresampled($newimg, $sourceImg, 0, 0, 0, 0, $thumbWidth, ($thumbWidth) / $ratio, $width, $height);
ImageJpeg($newimg, $thumbSrc);
}
if ($ratio
$newimg = imagecreatetruecolor(($thumbHeight) * $ratio, $thumbHeight);
imagecopyresampled($newimg, $sourceImg, 0, 0, 0, 0, ($thumbHeight) * $ratio, $thumbHeight, $width, $height);
ImageJpeg($newimg, $thumbSrc);
}
}
//銷毀圖像
ImageDestroy($sourceImg);
}
?>
調用示例：<?php
//圖檔源路徑
$imgSrc="D:/PHP/test/demo.jpg";
//縮略圖路徑
$thumbSrc="D:/PHP/test/thumb.jpg";
createThumbImg($path,100,100,$thumbSrc);
?>