为什么这段 PHP 代码在 php7.1 和 php5.5 中执行不一样

为什么这段 PHP 代码在 php7.1 和 php5.5 中执行不一样

function phash(file)
{
$resource=imagecreatefromstring(file_get_contents($file));
$size=8;
$width = $size + 1;
$heigth = $size;
$resized = imagecreatetruecolor($width, $heigth);
imagecopyresampled($resized, $resource, 0, 0, 0, 0, $width, $heigth, imagesx($resource), imagesy($resource));
$hash = 0;
$one = 1;
for ($y = 0; $y < $heigth; $y++) {
$rgb = imagecolorsforindex($resized, imagecolorat($resized, 0, $y));
$left = floor(($rgb['red'] + $rgb['green'] + $rgb['blue']) / 3);
for ($x = 1; $x < $width; $x++) {
$rgb = imagecolorsforindex($resized, imagecolorat($resized, $x, $y));
$right = floor(($rgb['red'] + $rgb['green'] + $rgb['blue']) / 3);
if ($left > $right) {
$hash |= $one;
}
$left = $right;
$one = $one << 1;
}
}
imagedestroy($resized);
return dechex($hash);
}这样试试呢，希望能帮到你，我刚在后盾网下课，准备吃饭呢，Σ(|||▽||| )

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