无法使用自定义函数在PHP中格式化字符串

您需要将所有操作的结果指定给即将返回的变量

<?php
$string = 'tHis is aN unEVen string that needs to be formated properly';

// custom function created combining multiple functions
function varform($var){
   ucwords(strtolower(htlmentities(trim($var))));
   return $var;
}

$string = varform($string);
echo $string;
?>

---

1用htmlentities替换htlmentities

正如前面的评论所说

<?php
$string = 'tHis is aN unEVen string that needs to be formated properly';

// custom function created combining multiple functions
function varform($var){
   // assign change to the variable
   $var = ucwords(strtolower(htmlentities(trim($var))));
   return $var;
}

$string = varform($string);
echo $string;
?>

---

您的代码有两个问题

function varform($var){
  return ucwords(strtolower(htmlentities(trim($var))));
}

您需要从PHP方法中获取返回值，并从函数中返回该值

function varform($var){
   ucwords(strtolower(htlmentities(trim($var))));
------------------------^ //It's htmlentities() not htlmentities()
   return $var; //you're just returning the value that is passed to the method
}

---

欢迎使用SO，请使用提供的格式化工具格式化您的问题。这次我帮你把它清理干净了。htlmentities就是htmlentities你打错了mistake@johnP-谢谢，我现在也把它修好了

function varform($var){
   $var = ucwords(strtolower(htmlentities(trim($var))));
   return $var;
}