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php数组键名技巧小结

Jun 13, 2016 am 09:12 AM
phpmainskillsanalyzecommonSkillarrayarticleofKey name

php数组键名技巧小结

 这篇文章主要介绍了php数组键名技巧小结,分析了php数组键名常见的使用技巧,具有一定参考借鉴价值,需要的朋友可以参考下

 

 

本文较为详细的总结了php数组键名的技巧。分享给大家供大家参考。具体分析如下:

1、$arr[true] 等价于 $arr[1];$arr[false] 等价于 $arr[0]。

2、使null做为键名,相当于创建或覆盖一个$arr[null],可以使用$arr[null]或$arr[""]来访问。

3、使用带小数点的数字作为键名时,键名会自动截取整数部分作为键名。如$arr[123.45]=5,你使用$arr[123.45]或$arr[123]均可以取得键值;用foreach遍历时,使用的是$arr[123]。

4、$arr[]=5,会在数组$arr后面添加上该元素。

注:数组中键名的数据类型为整数或字符串型

希望本文所述对大家的php程序设计有所帮助。

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