What are the potential pitfalls of trying to check the size of an image before uploading it?

When trying to check the size of an image before uploading it, one potential pitfall is that the file size reported by the client-side browser may not always be accurate due to various factors such as browser settings or network conditions. To solve this issue, it is recommended to also validate the file size on the server-side to ensure accuracy. 

// Server-side validation to check the size of the uploaded image
$maxFileSize = 5 * 1024 * 1024; // 5 MB
if ($_FILES['image']['size'] > $maxFileSize) {
    echo "Error: File size exceeds the limit of 5MB.";
    // Add further actions to handle the error, such as redirecting or displaying an error message
} else {
    // Proceed with the image upload process
}

Keywords

file size image upload PHP memory limit validation

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