How can the dimensions of uploaded images be restricted in PHP?

To restrict the dimensions of uploaded images in PHP, you can use the `getimagesize()` function to get the dimensions of the uploaded image and then compare them to the desired dimensions. If the uploaded image does not meet the specified dimensions, you can prevent the image from being uploaded or resize it accordingly. 

// Get the dimensions of the uploaded image
list($width, $height) = getimagesize($_FILES["fileToUpload"]["tmp_name"]);

// Specify the desired dimensions
$desiredWidth = 800;
$desiredHeight = 600;

// Check if the dimensions meet the specified requirements
if ($width != $desiredWidth || $height != $desiredHeight) {
    echo "Image dimensions must be $desiredWidth x $desiredHeight pixels.";
    // Prevent the image from being uploaded or resize it accordingly
} else {
    // Proceed with the image upload process
}

Keywords

PHP image upload image dimensions image manipulation GD library

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