PHP Try-catch 语句使用技巧,try-catch使用技巧
PHP Try-catch 语句使用技巧,try-catch使用技巧
PHP Try-catch 语句
为了进一步处理异常,我们需要使用try-catch语句----包括Try语句和至少一个的catch语句。任何调用 可能抛出异常的方法的代码都应该使用try语句。Catch语句用来处理可能抛出的异常。以下显示了我们处理getCommandObject()抛出的异常的方法:
<?php try { $mgr = new CommandManager(); $cmd = $mgr->getCommandObject("realcommand"); $cmd->execute(); } catch (Exception $e) { print $e->getMessage(); exit(); } ?>
可以看到,通过结合使用throw关键字和try-catch语句,我们可以避免错误标记“污染”类方法返回的值。因为“异常”本身就是一种与其它任何对象不同的PHP内建的类型,不会产生混淆。
如果抛出了一个异常,try语句中的脚本将会停止执行,然后马上转向执行catch语句中的脚本。
如果异常抛出了却没有被捕捉到,就会产生一个fatal error。
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