$php_errormsg

前一个错误信息

Warning

This feature has beenDEPRECATEDas of PHP 7.2.0. Relying on this featureis highly discouraged.

说明

$php_errormsg变量包含由 PHP 生成的最新错误信息。这个变量只在错误发生的作用域内可用，并且要求track_errors配置项是开启的（默认是关闭的）。

Warning

如果用户定义了错误处理句柄（set_error_handler()）并且返回FALSE的时候，$php_errormsg就会被设置。

范例

Example #1$php_errormsg范例

<?php
@strpos();
echo $php_errormsg;
?>

以上例程的输出类似于：

Wrong parameter count for strpos()

While $php_errormsg is a global, it is not a superglobal.
You'll have to qualify it with a global keyword inside a function.
<?php
function checkErrormsg()
{
  global $php_errormsg;
  @strpos();
  return $php_errormsg;
}
?>

Note: This variable doesn't seem to get populated if you're running Xdebug.

$php_errormsg does not contain the error message generated inside a function. See the example below:
<?php
@strpos();
function checkErrormsg()
{
  global $php_errormsg;
  echo "First Error is: $php_errormsg <br />";
  @ini_set();
  echo "Error is: $php_errormsg";
}
checkErrormsg();
?>
This will output:
First Error is: strpos() expects at least 2 parameters, 0 given 
Error is: strpos() expects at least 2 parameters, 0 given

The track_errors parameter is PHP_INI_ALL, so you can use code like this:
<?php
ini_set('track_errors', 1);
$result = @do_risky_thing();
if (! $result) {
  echo '<p>Error' . htmlspecialchars($php_errormsg) . '</p>';
}
ini_set('track_errors', 0);
?>