Add text watermark and text shadow to pictures in php

Add text watermark and text shadow to pictures in php_PHP tutorial

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Release： 2016-07-13 10:46:24

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To add watermarks to images in PHP, we need to install the GD library for PHP. Here we will not introduce the GD library installation, but only introduce how to use PHP to add text watermarks to images and add text shadow effects.

GD library is an extension library for PHP to process graphics. The GD library provides a series of APIs for processing pictures. You can use the GD library to process pictures or generate pictures. On websites, the GD library is usually used to generate thumbnails, add watermarks to images, generate Chinese character verification codes, or generate reports on website data.

Add text watermark and text shadow to pictures in php_PHP tutorial

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Add text watermark and text shadow to pictures in php_PHP tutorial

The installation of the GD library is available online, and many virtual spaces now support it, so I won’t go into details here. Below, I will introduce how to use the GD library through examples of my actual application code and related comments.

//Output $im ImageJpeg($im);

The code is as follows

代码如下

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$str="北京";
$str2= "空气质量：轻度污染";
// 通过图片生成一个对象$im
$im = imagecreatefromjpeg("images/3.jpg");
//载入字体zt.ttf
$fnt = "zt.ttf";
//创建颜色，用于文字字体的白和阴影的黑
$white=imagecolorallocate($im,222,229,207);
$black=imagecolorallocate($im,50,50,50);
//创建关于相对图片位置的函数，方便调用
$top=100;
$left=60;
$top2=170;
//在图片中添加文字，imagettftext (image,size,angle, x, y,color,fontfile,text)
imagettftext($im,41, 0, $left+1, $top+1, $black, $fnt, $str);
imagettftext($im,41, 0, $left, $top, $white, $fnt, $str);
imagettftext($im,43, 0, $left+1,$top2+1 , $black, $fnt, $str2);
imagettftext($im,43, 0, $left,$top2, $white, $fnt, $str2);
//将$im输出
ImageJpeg($im);
//销毁$im对象
ImageDestroy($im);

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$str="Beijing"; $str2= "Air Quality: Mild Pollution";

// Generate an object from the image $im

$im = imagecreatefromjpeg("images/3.jpg");