• 1. strlen strlen: 数组名 | 字符串长度

• 1.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。
  dict.yoduao.com
• 2.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PHP strlen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。
  dict.yoduao.com
• 3.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。
  dict.yoduao.com

©2026 网易公司