imagecreatefromjpegAllowed memory size of 13421772

錯誤

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 3200 bytes) in

$image_path = 'E:\www\01.jpg';
echo '1: ' . memory_get_usage() . '<br>';
$img1 = imagecreatefromjpeg($image_path);
echo '2: ' . memory_get_usage() . '<br>';
$img2 = imagecreatetruecolor(800, 23277);
echo '3: ' . memory_get_usage() . '<br>';

輸出以下：

1: 1117840

2: 95350704

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 3200 bytes) in E:\www\Demo.php on line 88

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能夠看出，imagecreatefromjpeg用了94M內存，下面的imagecreatetruecolor也須要94M內存，二者加上就超過默認的128M了，因此，imagecreatetruecolor函數報錯，緣由在哪裏，由於這個圖片的高度實在過高了，23227個像素

解決辦法

先獲取圖片的高度，若是高度大於10000，那就就設置php可用內存ini_set('memory_limit', '256M');

$image_path = 'E:\www\01.jpg';
$image_info = getimagesize($image_path);
if ($image_info[1] > 10000) {
    ini_set('memory_limit', '256M');
}
echo '1: ' . memory_get_usage() . '<br>';
$img1 = imagecreatefromjpeg($image_path);
echo '2: ' . memory_get_usage() . '<br>';
$img2 = imagecreatetruecolor(800, 23277);
echo '3: ' . memory_get_usage() . '<br>';

輸出以下：

1: 1120504

2: 95353368

3: 135840936