【发布时间】:2016-03-17 21:55:09
【问题描述】:
我有一个 php 代码,它通过 ajax 调用获取其值。这些值由用户用于裁剪图像的裁剪模块提供。
<?php
ini_set('Memory_limit', -1);
$imgUrl = $_POST['imgUrl'];
// original sizes
$imgInitW = $_POST['imgInitW'];
$imgInitH = $_POST['imgInitH'];
// resized sizes
$imgW = $_POST['imgW'];
$imgH = $_POST['imgH'];
// offsets
$imgY1 = $_POST['imgY1'];
$imgX1 = $_POST['imgX1'];
// crop box
$cropW = $_POST['cropW'];
$cropH = $_POST['cropH'];
// rotation angle
$angle = $_POST['rotation'];
$jpeg_quality = 100;
$uniquename=uniqid().time();
$output_filename = "croppedimages/".$uniquename;
// uncomment line below to save the cropped image in the same location as the original image.
//$output_filename = dirname($imgUrl). "/croppedImg_".rand();
$what = getimagesize($imgUrl);
switch(strtolower($what['mime']))
{
case 'image/png':
$img_r = imagecreatefrompng($imgUrl);
$source_image = imagecreatefrompng($imgUrl);
$type = '.png';
break;
case 'image/jpeg':
$img_r = imagecreatefromjpeg($imgUrl);
$source_image = imagecreatefromjpeg($imgUrl);
error_log("jpg");
$type = '.jpeg';
break;
case 'image/gif':
$img_r = imagecreatefromgif($imgUrl);
$source_image = imagecreatefromgif($imgUrl);
$type = '.gif';
break;
default: die('image type not supported');
}
//Check write Access to Directory
if(!is_writable(dirname($output_filename))){
$response = Array(
"status" => 'error',
"message" => 'Can`t write cropped File'
);
}else{
// resize the original image to size of editor
$resizedImage = imagecreatetruecolor($imgW, $imgH);
imagecopyresampled($resizedImage, $source_image, 0, 0, 0, 0, $imgW, $imgH, $imgInitW, $imgInitH);
// rotate the rezized image
$rotated_image = imagerotate($resizedImage, -$angle, 0);
// find new width & height of rotated image
$rotated_width = imagesx($rotated_image);
$rotated_height = imagesy($rotated_image);
// diff between rotated & original sizes
$dx = $rotated_width - $imgW;
$dy = $rotated_height - $imgH;
// crop rotated image to fit into original rezized rectangle
$cropped_rotated_image = imagecreatetruecolor($imgW, $imgH);
imagecolortransparent($cropped_rotated_image, imagecolorallocate($cropped_rotated_image, 0, 0, 0));
imagecopyresampled($cropped_rotated_image, $rotated_image, 0, 0, $dx / 2, $dy / 2, $imgW, $imgH, $imgW, $imgH);
// crop image into selected area
$final_image = imagecreatetruecolor($cropW, $cropH);
imagecolortransparent($final_image, imagecolorallocate($final_image, 0, 0, 0));
imagecopyresampled($final_image, $cropped_rotated_image, 0, 0, $imgX1, $imgY1, $cropW, $cropH, $cropW, $cropH);
// finally output png image
//imagepng($final_image, $output_filename.$type, $png_quality);
imagejpeg($final_image, $output_filename.$type, $jpeg_quality);
$response = Array(
"status" => 'success',
"url" => $output_filename.$type,
);
}
print json_encode($response);
这里 cropW 和 cropH 是裁剪后的图像的值。但是,这对于低分辨率图像效果很好,但是当使用高分辨率图像时,控制台会显示错误在imagecreatetruecolor 函数上。
致命错误:允许的内存大小为 134217728 字节已用尽
现在即使我通过ini_set('Memory_limit', -1); 设置内存使用量,它仍然会显示此错误。可能是什么原因以及解决方案是什么?
注意:我知道设置ini_set('Memory_limit', -1); 是个坏主意。
【问题讨论】:
-
您是自托管还是付费提供商?
-
现在在本地主机上工作,但可能会将此模块添加到实时网站。我将使用其他一些图像处理库。这里的这个是用于学习目的。
-
你在运行 suhosin 吗?
-
GD 必须将整个图像加载到内存中才能使用它。使用没有此限制的ImageMagick functions 可能会更好。
-
不,我没有使用它@mkaatman
标签: php