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。
So, to get the correct length of string encoded in utf-8, you have to use mb_strlen (string, "utf-8") instead of just strlen (string).
因而，要获得以utf - 8编码的字符串的正确长度，必须使用mb_strlen (string，“ utf - 8 ”)，而不只是strlen (string)。
When working with strings and you need to check that the string is either of a certain length you'd understandably would want to use the strlen function.
当操作字符串并需要检验其长度是否满足某种要求时，你想当然地会使用strlen函数。
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。
Calling isset happens to be faster then strlen because unlike strlen , isset is a language construct and not a function meaning that it's execution does not require function lookups and lowercase.
调用isset恰巧比strlen快，因为与后者不同的是，isset作为一种语言结构，意味着它的执行不需要函数查找和字母小写化。
Calling isset happens to be faster then strlen because unlike strlen , isset is a language construct and not a function meaning that it's execution does not require function lookups and lowercase.
调用isset恰巧比strlen快，因为与后者不同的是，isset作为一种语言结构，意味着它的执行不需要函数查找和字母小写化。
应用推荐