So strlen is the length of a string.
所以strlen就是字符串的长度。
A common use of strlen is to estimate display-width.
strlen的一种常见用法是估算显示宽度。
You may receive error messages about strcasecmp as well as about strlen being undeclared.
您可能会收到有关strcasecmp以及strlen未声明的错误消息。
First, I'm going to do a sanity check strlen so we've used string length, strlen, before.
首先，我先做一个检查，我们以前使用过字符串长度函数。
So, for example, if you've coded your own strlen function, PHP would resolve to your function.
例如，如果您编写了自己的strlen函数，php会解析出您的函数。
An example of a library function that does not have an associated system call is the strlen function declared in string.h.
没有相关系统调用的库函数的一个示例是string . h中声明的strlen函数。
If no width argument is given, the appropriate width is autocomputed from the comment argument itself (strlen(a:comment)+2).
如果没有提供宽度参数，那么将自动根据注释参数本身计算相应的宽度（strlen(a:comment)+2）。
Next the function determines the length of each assignment's lvalue, by mapping the strlen function over a copy of the filtered lines.
接下来的函数确定每个赋值项的lvalue的长度，这通过将strlen函数映射到已过滤的函数的副本上来实现。
But, if you also wanted to use the standard PHP strlen function (say, within your own strlen implementation), you'd need to precede the function invocation with a backslash, as Listing 10 shows.
但是，如果也希望使用标准的PHPstrlen函数(比如在自己的strlen实现内部)，就需要在函数调用前面加上反斜杠，见清单10。
But, if you also wanted to use the standard PHP strlen function (say, within your own strlen implementation), you'd need to precede the function invocation with a backslash, as Listing 10 shows.
但是，如果也希望使用标准的PHPstrlen函数(比如在自己的strlen实现内部)，就需要在函数调用前面加上反斜杠，见清单10。
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