imagetypes()

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

返回当前 PHP 版本所支持的图像类型

说明

imagetypes(void): int

本函数以比特字段方式返回与当前 PHP 版本关联的 GD 库所支持的图像格式。将返回以下结果，IMG_GIF| IMG_JPG| IMG_PNG| IMG_WBMP|IMG_XPM。例如要检查是否支持 PNG，这样做：

imagetypes()例子

<?php
if (imagetypes() & IMG_PNG) {
    echo "PNG Support is enabled";
}
?>

Im not a smart man but this seemd to be the simplest code and it worked.
Its at the very top of this directory.
<?php
var_dump(gd_info());
?> 
Returned image info and more.
array(11) { ["GD Version"]=> string(27) "bundled (2.0.28 compatible)" ["FreeType Support"]=> bool(true) ["FreeType Linkage"]=> string(13) "with freetype" ["T1Lib Support"]=> bool(false) ["GIF Read Support"]=> bool(true) ["GIF Create Support"]=> bool(true) ["JPG Support"]=> bool(true) ["PNG Support"]=> bool(true) ["WBMP Support"]=> bool(true) ["XBM Support"]=> bool(true) ["JIS-mapped Japanese Font Support"]=> bool(false) }