How to add text watermarks through imagegetclip after image cropping

1. What is imagegetclip?

imagegetclip is not a built-in PHP function, it is generally a user-defined function for image cropping. In order to realize the functions of this article, we simply define an imagegetclip() function, which aims to cut out a rectangular area from the source diagram.

2. Realize the complete process of cropping and adding watermarks

The complete steps are as follows:

1. Load the source map;

2. Crop the image;

3. Add text watermark;

4. Output or save the image.

Below is a complete code example.

 <?php

function imagegetclip($src_path, $x, $y, $width, $height) {
    $src = imagecreatefromjpeg($src_path);
    $clip = imagecreatetruecolor($width, $height);
    imagecopy($clip, $src, 0, 0, $x, $y, $width, $height);
    return $clip;
}

function addTextWatermark($image, $text, $fontSize = 12, $color = [255, 255, 255], $x = 10, $y = 20) {
    $textColor = imagecolorallocate($image, $color[0], $color[1], $color[2]);
    imagestring($image, $fontSize, $x, $y, $text, $textColor);
    return $image;
}

// Example：Processing images
$source_image = 'https://gitbox.net/images/sample.jpg';
$temp_path = '/tmp/temp.jpg';
file_put_contents($temp_path, file_get_contents($source_image));

$clip = imagegetclip($temp_path, 100, 100, 300, 200);
$clip_with_watermark = addTextWatermark($clip, 'gitbox.netExclusive');

header('Content-Type: image/jpeg');
imagejpeg($clip_with_watermark);
imagedestroy($clip_with_watermark);
?>

3. Explanation

• The imagegetclip() function clips the specified area from the original image;

• addTextWatermark() function to add watermark text;

• The basic fonts added using imagestring() . If you need to use custom fonts and styles, it is recommended to use imagettftext() ;

• Remote images are downloaded to a temporary directory through file_get_contents() ;

• Note that the server must enable GD extension.

4. Supplement: Use custom fonts to beautify watermark text

 imagettftext($image, 16, 0, 10, 30, $textColor, '/path/to/font.ttf', 'gitbox.netExclusive');

This code uses TTF font to achieve more beautiful watermark text. Ensure that the font path is valid and supports Chinese or required character sets.