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How to escape slash in php7.0

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Mar 21, 2023 pm 04:32 PM

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在 PHP7.0 中，斜杠转义（backslash escaping）的行为发生了一些变化。斜杠转义是一种特殊的字符序列，在 PHP 中用于表达难以输入或者表示的字符内容。

在旧版本的 PHP 中，斜杠转义的行为相对简单，只需要在需要斜杆作为普通字符使用的位置输入两个斜杠即可。

例如，在 PHP5.6 中，以下代码可以输出斜杠 /：

echo '\\/';

然而，在 PHP7.0 中，如果使用了这种方式进行斜杠转义，则会发生错误。

在 PHP7.0 中，斜杠转义的行为更加严格，每个斜杠都需要使用两个斜杠进行转义。

因此，在 PHP7.0 中，以下代码可以输出斜杠 /：

echo '\\\\/';

这一变化的原因，是因为在 PHP7.0 中重新实现了内部编码方式。

在 PHP7.0 中，内部编码方式从 ISO-8859-1 转换为 UTF-8。这一变化带来了更广泛的字符集支持，同时也带来了斜杠转义行为的变化。

需要注意的是，这一变化可能会影响旧版本的代码的运行，因此在升级到 PHP7.0 时需要进行相应的调整。

总结：

在 PHP7.0 中，斜杠转义的行为发生了变化，每个斜杠都需要使用两个斜杠进行转义。

这一变化的原因是由于 PHP7.0 内部编码方式的变化造成的，需要注意旧版本代码在升级时可能会受到影响。

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