How Can I Reliably Verify Image File Type in PHP?

Verifying Image File Type in PHP

Securing file uploads is crucial to prevent malicious content from entering your system. In PHP, validating whether a received file is an image is essential.

While checking the file extension may appear insufficient, using getimagesize() offers a more reliable approach. This function analyzes the file's header information to determine its type. Here's a sample code snippet:

<code class="php">if (@is_array(getimagesize($mediapath))) {
    $image = true;
} else {
    $image = false;
}</code>

getimagesize() returns an array with the image dimensions, format, and additional information. A successful validation will result in an array, while a failure indicates a non-image file.

This approach ensures that only genuine image files are accepted, safeguarding your application from malicious file uploads.

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