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                **一.資源遷移對象的原因** 1.PHP開發的長期努力之一就是擺脫resource類型。它們很難處理,甚至在PHP 8.0中也不提供鍵入支持. 2.PHP resource對象在垃圾回收器中也無法很好地發揮作用,這導致resource諸如之類的對象發生內存泄漏xml. 3.在PHP 8.0中,一些最常用的擴展更改已從傳統resource對象轉移到標準PHP類. &emsp; **二.資源遷移對象兼容性** PHP 8.0resource到對象的遷移是無縫的,因為所有函數都返回并接受新對象,并且行為與先前resource對象的語義相同. &emsp; **三.實例** 1.查看資源遷移情況 ``` $img='course.png'; $obj=imagecreatefrompng($img); var_dump($obj); ``` 2.無兼容性操作gd ``` header('content-type:image/png'); $img='course.png'; $obj=imagecreatefrompng($img); imagepng($obj); //imagepng($obj,'course_out.png'); ``` 3.檢測環境是否支持jpeg ``` header('content-type:image/jpeg'); $img='yzmedu.jpg'; $obj=imagecreatefromjpeg($img); imagejpeg($obj); //imagejpeg($obj,'yzmedu_out.jpg'); ``` &emsp; **配套的PHP8新特性詳解視頻教程,請查看以下專輯** 鏈接:[https://www.ixigua.com/6937490165329822219](https://www.ixigua.com/6937490165329822219)
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