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                        /手把手教你实现电商网站后台开发

封装图片水印

<?php 
$srcFile="../images/logo.jpg";
$dstFile="des_big.jpg";
waterPic($dstFile,$srcFile,50);

function waterPic($dstFile,$srcFile="../images/logo.jpg",$pct=30){
    $groundImg = $dstFile;
    $groundInfo = getimagesize($groundImg);
    $ground_w = $groundInfo[0];
    //print_r($groundInfo);
    $ground_h = $groundInfo[1];
    switch($groundInfo[2]){
    case 1:
    $ground_im = imagecreatefromgif($groundImg);
    break;
    case 2:
    $ground_im = imagecreatefromjpeg($groundImg);
    break;
    case 3:
    $ground_im = imagecreatefrompng($groundImg);
    break;
    }

    $waterImg = $srcFile;
    $imgInfo =getimagesize($waterImg);
    $water_w = $imgInfo[0];
    $water_h = $imgInfo[1];

    switch($imgInfo[2]){
    case 1:
    $water_im = imagecreatefromgif($waterImg);
    break;
    case 2:
    $water_im = imagecreatefromjpeg($waterImg);
    break;
    case 3:
    $water_im = imagecreatefrompng($waterImg);
    break;
    }
    // imagecopy($ground_im,$water_im,100,100,0,0,500,500);
    imagecopymerge($ground_im, $water_im, 0,0,0,0, $water_w, $water_h,$pct);
    header("Content-type: image/jpeg");

    imagejpeg($ground_im);
}