Using getimagesizefromstring to Retrieve Image Dimensions from a String in PHP
getimagesizefromstring is a PHP function that extracts an image’s width and height from raw image data supplied as a string, mirroring getimagesize but accepting string input; the article explains its parameters, return values, and provides example code comparing file‑based and string‑based usage.
The PHP function getimagesizefromstring works like getimagesize but takes the image data as a string instead of a filename.
Parameters:
imagedata : string containing the raw image data.
imageinfo (optional, passed by reference): receives additional information as described in getimagesize.
Return value: an array where index 0 and 1 contain the image width and height respectively; other indexes provide MIME type and optional info.
Example:
<?php
$img = '/path/to/test.png';
$size_info1 = getimagesize($img); // file‑based
$data = file_get_contents($img); // read file into string
$size_info2 = getimagesizefromstring($data); // string‑based
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