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PHP解碼base64編碼的圖片例

阿新 • • 發佈：2019-01-21

有一個圖片，用base64編碼之後形成一個字串，如何拿到原先的內容呢，需要新建兩個檔案。

一個檔案負責解碼base64字串"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";

base64.php

<?php
$str = "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";
echo base64_decode($str);
?>
另外一個檔案負責在瀏覽器上輸出解碼之後的圖片

base64img.php

<img src="base64.php" />
輸出：










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