Examples of codes to add watermarks or text to php images

This article introduces examples of using PHP code to add watermarks or text to pictures. Friends in need can refer to it.

php watermark code, as follows:

<?php
/**
* 图片加水印、加文字
* edit bbs.it-home.org
*/
header("content-type:image/png");
 
$button_text = "click here";
$color = 'purple';
  
$image = imagecreatefrompng("image/".$color.'.png');  
$width_image = imagesx($image);  
$height_image = imagesy($image);  
  
$width_image_wo_margins = $width_image - (2*2);  
$height_image_wo_margins = $height_image - (2*2);  

//echo $width_image;  
//echo "<br>";  
//Echo $height_image;  
//exit;  
  
$font_size = 88;  
  
//putenv("GDFONTPATH=C:/WINDOWS/Fonts");  
  
$fontname = "ARIAL.TTF";  
  
do  
{  
    $font_size--;  
    $bbox = imagettfbbox($font_size,0,$fontname,$button_text);  
      
    $right_text = $bbox[2];  
    $left_text = $bbox[0];  
    $width_text = $right_text - $left_text;
    $height_text = abs($bbox[7] - $bbox[1]);
}while($font_size > 8 && ($height_text > $height_image_wo_margins || $width_text > $width_image_wo_margins));
  
$text_x = $width_image/2.0 - $width_text/2.0;
$text_y = $height_image/2.0 - $height_text/2.0;
  
if($left_text < 0){  
    $text_x += abs($left_text);
}  
  
$above_line_text = abs($bbox[7]);
$text_y += $above_line_text;
  
$text_y -= 2;
  
$white = imagecolorallocate($image,255,255,255);
  
imagettftext($image,$font_size,0,$text_x,$text_y,$white,$fontname,$button_text);
 
imagepng($image);
imagedestroy($image);
?>

The above code is implemented: Add an English word "click here" above a button image.

Personally, I think it is a relatively simple example of learning PHP image watermarking, suitable for reference by novice friends.