imageistruecolor
(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)
imageistruecolor — 检查图像是否为真彩色图像
说明
imageistruecolor(resource
$image
): bool
imageistruecolor() 检查
image
图像是否为真彩色图像。
返回值
如果 image
是真彩色图像返回 true
,否则返回 false
。
范例
示例 #1 Simple detection of true color image instances using imageistruecolor()
<?php
// $im is an image instance
// Check if image is a true color image or not
if(!imageistruecolor($im))
{
// Create a new true color image instance
$tc = imagecreatetruecolor(imagesx($im), imagesy($im));
imagecopy($tc, $im, 0, 0, 0, 0, imagesx($im), imagesy($im));
imagedestroy($im);
$im = $tc;
$tc = NULL;
}
// Continue working with image instance
?>
注释

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