What are some common reasons for PHP not outputting an image when using the header("Content-type: image/png") function?

One common reason for PHP not outputting an image when using the header("Content-type: image/png") function is that there may be output being sent to the browser before the image data. This can corrupt the image data and prevent it from being displayed. To solve this issue, make sure there is no whitespace or other output before the image data is sent. 

<?php
ob_start(); // Start output buffering
header("Content-type: image/png");
$image_data = file_get_contents("image.png");
echo $image_data;
ob_end_flush(); // Flush output buffer
?>

Keywords

header Content-type image/png output PHP

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