如何检查字符串是否以"_"开头在PHP中? [英] How to check if a string starts with "_" in PHP?

问题描述

示例:我有一个$variable = "_foo"，并且我想绝对确保$ variable不会以下划线"_"开头.如何在PHP中做到这一点?可以在字符串后面访问char数组吗?

Example: I have a $variable = "_foo", and I want to make absolutely sure that $variable does not start with an underscore "_". How can I do that in PHP? Is there some access to the char array behind the string?

推荐答案

您可能会签出php中的substr函数并以这种方式获取第一个字符:

You might check out the substr function in php and grab the first character that way:

http://php.net/manual/zh/function.substr.php

if (substr('_abcdef', 0, 1) === '_') { ... }

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