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php通过function_exists检测函数是否存在的方法,phpfunction_exists

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Release: 2016-06-13 09:11:24
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php通过function_exists检测函数是否存在的方法,phpfunction_exists

本文实例讲述了php通过function_exists检测函数是否存在的方法。分享给大家供大家参考。具体分析如下:

php中可以通过function_exists()函数检测另外一个函数是否存在,可以把函数名作为一个字符串传入function_exists,判断该还是是否存在

function highlight( $txt ) {
  return "$txt";
}
function textWrap( $tag, $txt, $func="" ) {
 if (function_exists( $func ) )
  $txt = $func($txt);
  return "<$tag>$txt\n";
}
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用法示例如下:

echo textWrap('i','function exists Demo','highlight');
//输出结果为斜体字的: function exists Demo
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希望本文所述对大家的php程序设计有所帮助。

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