从php.net

@Alexandre -简短的解决方案

<?php
function vname(&$var, $scope=0)
{
    $old = $var;
    if (($key = array_search($var = 'unique'.rand().'value', !$scope ? $GLOBALS : $scope)) && $var = $old) return $key;  
}
?>

@Lucas - usage

<?php
//1.  Use of a variable contained in the global scope (default):
  $my_global_variable = "My global string.";
  echo vname($my_global_variable); // Outputs:  my_global_variable

//2.  Use of a local variable:
  function my_local_func()
  {
    $my_local_variable = "My local string.";
    return vname($my_local_variable, get_defined_vars());
  }
  echo my_local_func(); // Outputs: my_local_variable

//3.  Use of an object property:
  class myclass
  {
    public function __constructor()
    {
      $this->my_object_property = "My object property  string.";
    }
  }
  $obj = new myclass;
  echo vname($obj->my_object_property, $obj); // Outputs: my_object_property
?>

为什么我们必须使用全局变量来获取变量名…我们可以像下面这样简单地使用。

    $variableName = "ajaxmint";

    echo getVarName('$variableName');

    function getVarName($name) {
        return str_replace('$','',$name);
    }

从php.net

@Alexandre -简短的解决方案

<?php
function vname(&$var, $scope=0)
{
    $old = $var;
    if (($key = array_search($var = 'unique'.rand().'value', !$scope ? $GLOBALS : $scope)) && $var = $old) return $key;  
}
?>

@Lucas - usage

<?php
//1.  Use of a variable contained in the global scope (default):
  $my_global_variable = "My global string.";
  echo vname($my_global_variable); // Outputs:  my_global_variable

//2.  Use of a local variable:
  function my_local_func()
  {
    $my_local_variable = "My local string.";
    return vname($my_local_variable, get_defined_vars());
  }
  echo my_local_func(); // Outputs: my_local_variable

//3.  Use of an object property:
  class myclass
  {
    public function __constructor()
    {
      $this->my_object_property = "My object property  string.";
    }
  }
  $obj = new myclass;
  echo vname($obj->my_object_property, $obj); // Outputs: my_object_property
?>

我也想不出有效的方法但我想到了这个。对于下面的有限用途，它是有效的。

耸耸肩

<?php

function varName( $v ) {
    $trace = debug_backtrace();
    $vLine = file( __FILE__ );
    $fLine = $vLine[ $trace[0]['line'] - 1 ];
    preg_match( "#\\$(\w+)#", $fLine, $match );
    print_r( $match );
}

$foo = "knight";
$bar = array( 1, 2, 3 );
$baz = 12345;

varName( $foo );
varName( $bar );
varName( $baz );

?>

// Returns
Array
(
    [0] => $foo
    [1] => foo
)
Array
(
    [0] => $bar
    [1] => bar
)
Array
(
    [0] => $baz
    [1] => baz
)

它基于调用函数的行来工作，在那里它可以找到传入的参数。我认为它可以扩展到多个参数，但是，就像其他人说的，如果你能更好地解释情况，另一个解决方案可能会更好。

其他用途:

耸耸肩

function varsToArrayAssoc(...$arguments){
  
    $bt   = debug_backtrace();
    $file = file($bt[0]['file']);
    $src  = $file[$bt[0]['line']-1];
    $pat = '#(.*)'.__FUNCTION__.' *?\( *?(.*) *?\)(.*)#i';
    $vars  =explode(',',substr_replace(trim(preg_replace($pat, '$2', $src)) ,"", -1));
    $result=[];
    foreach(func_get_args() as $key=>$v){
        $index=trim(explode('$',$vars[$key])[1]);
        $result[$index]=$v;
    }
    return $result;
}

$a=12;
$b=13;
$c=123;
$d='aa';

var_dump(varsToArrayAssoc($a,$b,$c,$d));

您可以使用compact()来实现这一点。

$FooBar = "a string";

$newArray = compact('FooBar');

这将创建一个以变量名为键的关联数组。然后可以在需要的地方使用键名循环遍历数组。

foreach($newarray as $key => $value) {
    echo $key;
}