本扩展部分代码来源于网络，笔者这也是东拼西凑，希望能帮助到您的需求。
“EasySVG”可以将“文字信息(中文、字母、数字)”输出为SVG格式的矢量图，目前笔者开发这个扩展主要用于网络安全效验方面。目前“font”文件夹下的所有字库只支持“数字”，不过也可以继续完善你想要的功能，详情见本文档使用说明。
require_once( '../src/EasySVG.php' );
try {
$obj = ( new EasySVG() );
$result = $obj->CreateCaptcha();
print_r( $result );
} catch( Exception $e ) {
print_r( $e->getMessage() );
}
Array
(
[0] => 3269
[1] =>
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M128.4921875,35.764712069605l-0.1171875,0.56640625l0,0.1171875l0.3515625,0q0.5859375-0.2734375,0.5859375-0.68359375l-0.1171875,0.1171875l-0.1171875,0z M126.2265625,35.999087069605l0,0.1171875q0.17578125,0.46875,0.60546875,0.68359375l0-0.234375z M124.33203125,36.565493319605l0.3515625,0.234375l0.1171875,0l0-0.1171875l-0.1171875-0.3515625l-0.1171875,0z M121.71484375,37.034243319605l0,0.1171875l0.83984375,0.234375l-0.37109375-0.3515625l-0.46875,0z" />
<path fill="none" stroke="#777" d="M7 31 C82 34,86 1,138 35" />
<path fill="none" stroke="#555" d="M18 43 C69 17,88 15,130 32" />
<path fill="none" stroke="#999" d="M8 31 C95 36,66 5,138 31" /></svg>
)
而这种SVG数据既是我们平常见到的XML，本扩展输出的时候，默认是随机加载“SVG”字库，显示的字体的“坐标、颜色、干扰线”信息也是随机范围定义，由此看到的XML元素节点必定不会出现重复，理论上人的肉眼是难以看懂的，而“机器识别”也要识别若干的字体库，这对大小型企业的“安防机制”来说真的是不二之选。
若是您想生成独具风格的字体格式，请在这个网址，将您自己的喜欢的“TTF”字体转换至“SVG”矢量字库即可，然后将“SVG”矢量字库移动到“font”文件夹下即可。
require_once( '../src/EasySVG.php' );
try {
$obj = ( new EasySVG() );
$result = $obj->CreateCaptcha(
[
'width' => 150 ,
'height' => 50 ,
'size' => 4 ,
'ignoreChars' => '014abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' ,
'chars' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789' ,
'noise' => rand( 3 , 5 ) ,
'font' => [
'size' => 40 ,
'color' => false ,
//定义指定的“SVG”矢量字库文件地址，在实际运行中，需要做修改，下面只是笔者定义的示范！！！
'path' => '..\font\微软雅黑.svg',
] ,
] );
print_r( $result );
} catch( Exception $e ) {
print_r( $e->getMessage() );
}Email:[email protected]
觉得不错点个“Star”呗~