Detailed introduction to principles and performance

1: DOM DOM is the official W3C standard for representing XML documents in a platform- and language-independent way. The DOM is a collection of nodes or pieces of information organized in a hierarchical structure. This hierarchy allows developers to search the tree for specific information. Analyzing this structure typically requires loading the entire document and constructing the hierarchy before any work can be done. Because it is based on information hierarchy, the DOM is considered tree-based or object-based. DOM, and tree-based processing in general, has several advantages. First, because the tree is persistent in memory, it can be modified so that the application can make changes to the data and structures. It also allows navigation up and down the tree at any time, rather than a one-time process like SAX. DOM is also much simpler to use. On the other hand, for particularly large documents, parsing and loading the entire document can be slow and resource-intensive, so it is better to use other means to process such data. These are event-based models like SAX. 2: SAX The advantages of this processing are very similar to the advantages of streaming media. Analysis can start immediately instead of waiting for all data to be processed. Moreover, due to the application

1. Detailed explanation of the four parser principles and performance comparison of XML

##Introduction: DOM is the official W3C standard for representing XML documents in a platform- and language-independent way. The DOM is a collection of nodes or pieces of information organized in a hierarchical structure. This hierarchy allows developers to search for specific information in the tree. Analyzing this structure typically requires loading the entire document and constructing the hierarchy before any work can be done. Because it is based on information hierarchy, the DOM is considered tree-based or object-based. DOM, and tree-based processing in general, has several advantages.

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8. Baidu engineers talk about the implementation principles and performance analysis of PHP functions (3)_PHP tutorial

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