What are common errors or pitfalls when working with image manipulation functions in PHP, such as ImageCopy and ImageString?

One common error when working with image manipulation functions in PHP is not checking for errors or warnings that may occur during the process. It's important to handle these errors properly to prevent unexpected behavior or crashes. Another pitfall is not validating input data, which can lead to security vulnerabilities or incorrect output. Additionally, not properly setting up the environment or resources needed for image manipulation functions can cause them to fail. 

// Example of handling errors and warnings when using image manipulation functions
$source = imagecreatefromjpeg('image.jpg');
if (!$source) {
    die('Error loading image');
}

$destination = imagecreatetruecolor(200, 200);
if (!$destination) {
    die('Error creating image');
}

// Perform image manipulation operations here

// Example of validating input data before using image manipulation functions
$font = 'arial.ttf';
if (!file_exists($font)) {
    die('Font file not found');
}

// Example of setting up the environment for image manipulation functions
ini_set('memory_limit', '128M');
ini_set('max_execution_time', 300);

Keywords

ImageCopy ImageString image manipulation PHP errors pitfalls

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