在PHP中，L值前面的'at'符号是什么意思？ [重复]

问题描述：

This question already has an answer here:

Reference — What does this symbol mean in PHP? 18 answers

Everything I can find refers to the use of the @ symbol as a prefix to an expression, e.g.:

$foo = @bar();

This is not what I'm talking about here. I have a statement which uses the @ symbol as a prefix to an L-value, like:

@$foo = bar();

What does this mean?

(Ideally, please explain the semantics as a de-sugaring of this statement into one that does not use the @ symbol.)

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此问题已经存在这里有一个答案： p>

参考 - 这个符号在PHP中意味着什么？ 18 answers \ n span> li> ul> div>

我能找到的一切都是指使用@ code>符号作为表达式 em>的前缀，例如： p>

  $ foo = @bar（）; 
  code>  
 
 这是不 em>我在这里谈论的内容。 我有一个声明，它使用 @  code>符号作为L值的前缀，如： p> 
 
 
  @ $ foo = bar（）; \  n  code>  pre> 
 
 这是什么意思？ p> 
 
 
（理想情况下，请将语义解释为将此语句解压为一个语句 不使用 @  code>符号。） p> 
  div>

答

@ symbol is used to suppress error messages

PHP supports one error control operator: the at sign (@). When prepended to an expression in PHP, any error messages that might be generated by that expression will be ignored.

For example;

The following code doesn't produce any errors on screen;

<?php

ini_set('error_reporting', E_ALL);
ini_set('display_errors', 1);

@$foo = $bar;

echo $foo;

However, without the @ it does;

Notice: Undefined variable: bar in C:\xampp\htdocs\test\test.php on line 6

在PHP中，L值前面的'at'符号是什么意思？ [重复]

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