When manipulating text on images in PHP, what functions and techniques should be used to adjust the size and position of the text effectively?

When manipulating text on images in PHP, the `imagettfbbox()` function can be used to calculate the bounding box of a text string. This information can then be used to determine the appropriate size and position for the text on the image. Additionally, the `imagettftext()` function can be used to actually draw the text on the image with the desired font, size, and position. 

// Load the image
$image = imagecreatefromjpeg('image.jpg');

// Set the font size and path to the TrueType font file
$font_size = 20;
$font_path = 'arial.ttf';

// Get the bounding box of the text
$text = 'Hello, World!';
$bbox = imagettfbbox($font_size, 0, $font_path, $text);

// Calculate the position to center the text on the image
$x = imagesx($image) / 2 - ($bbox[2] - $bbox[0]) / 2;
$y = imagesy($image) / 2 + ($bbox[1] - $bbox[5]) / 2;

// Set the text color
$text_color = imagecolorallocate($image, 255, 255, 255);

// Draw the text on the image
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font_path, $text);

// Output the image
header('Content-Type: image/jpeg');
imagejpeg($image);

// Free up memory
imagedestroy($image);

Keywords

PHP image manipulation text positioning text resizing GD library

Related Questions