很好的一篇讲解PHP数组的博文，详细讲解了php中数组与其他语言的差别，内核如何实现数组，数组的遍历，另外还分析了网上广为谬传的foreach比for性能好的说法。 我自己也测试了下foreach和for的性能，在php 5.3 和5.4版本下，不管遍历时是否改写数组，还是for
很好的一篇讲解PHP数组的博文，详细讲解了php中数组与其他语言的差别，内核如何实现数组，数组的遍历，另外还分析了网上广为谬传的foreach比for性能好的说法。
我自己也测试了下foreach和for的性能，在php 5.3 和5.4版本下，不管遍历时是否改写数组，还是foreach时用引用方式，结果都未显示foreach优于for，我自己测试的结果是for比foreach还稍微快那么点儿:)如果foreach不采用引用方式，那for比foreach就快许多~
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英文原文：A Closer Look Into PHP Arrays: What You Don’t See
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