为什么“无法打破/继续 1 级”出现在 PHP 中？
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Why does 'Cannot break/continue 1 level' comes in PHP?
提问by Somnath Muluk
I am getting sometimes this error on production at:
我有时会在生产中遇到此错误：
if( true == $objWebsite ) {
$arrobjProperties = (array) $objWebsite->fetchProperties( );
if( false == array_key_exists( $Id, $Properties ) ) {
break;
}
$strBaseName = $strPortalSuffix . '/';
return $strBaseName;
}
$strBaseName = $strSuffix ;
return $strBaseName;
I have tried to reproduce this issue. But not getting any progress. $Id, $Properties having value received.
我试图重现这个问题。但没有任何进展。$Id, $Properties 已收到值。
Does anyone know when does 'Cannot break/continue 1 level' comes in PHP?
有谁知道 PHP 中的“无法中断/继续 1 级”何时出现？
I have seen this post PHP Fatal error: Cannot break/continue. But didn't got any help.
我看过这篇文章PHP Fatal error: Cannot break/continue。但没有得到任何帮助。
回答by Robbie
You can't "break" from an if statement. You can only break from a loop.
你不能从 if 语句中“中断”。您只能中断循环。
If you want to use it to break from a loop in a calling function, you need to handle this by return value - or throw an exception.
如果你想用它来打破调用函数中的循环，你需要通过返回值来处理它——或者抛出一个异常。
Return value method:
返回值方法：
while (MyLoop) {
$strSecureBaseName = mySubFunction();
if ($strSecureBaseName === false) { // Note the triple equals sign.
break;
}
// Use $strSecureBaseName;
}
// Function mySubFunction() returns the name, or false if not found.
Using exceptions - beautiful example here: http://php.net/manual/en/language.exceptions.php
使用异常 - 美丽的例子在这里：http: //php.net/manual/en/language.exceptions.php
<?php
function inverse($x) {
if (!$x) {
throw new Exception('Division by zero.');
}
else return 1/$x;
}
try {
echo inverse(5) . "\n";
echo inverse(0) . "\n";
} catch (Exception $e) {
echo 'Caught exception: ', $e->getMessage(), "\n";
}
// Continue execution
echo 'Hello World';
?>
回答by SudarP
If within a function just change break; to return;
如果在一个函数内只是改变 break; 返回;
回答by Somnath Muluk
If you want to still break from if, you can use while(true)
如果你还想打破if，你可以使用 while(true)
Ex.
前任。
$count = 0;
if($a==$b){
while(true){
if($b==$c){
$count = $count + 3;
break; // By this break you will be going out of while loop and execute remaining code of $count++.
}
$count = $count + 5; //
break;
}
$count++;
}
Also you can use switch and default.
您也可以使用 switch 和 default。
$count = 0;
if($a==$b){
switch(true){
default:
if($b==$c){
$count = $count + 3;
break; // By this break you will be going out of switch and execute remaining code of $count++.
}
$count = $count + 5; //
}
$count++;
}
