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PHP中性能优化之生成器

知其黑、受其白发布时间：2022-09-02 16:25:06 ，浏览量：5

阅读目录

阐述
- 创建生成器
- 使用生成器
- 应用场景

阐述

PHP生成器是5.5.0引入的功能，生成器实际上就是简单的迭代器。

生成器会根据需求计算产出迭代的值，而标准的PHP迭代器经常在内存中执行迭代操作，这要预先计算出数据集，性能较低。

如果使用特定的防护计算大量数据，可以使用生成器，即时计算并产出后续值，不占用内存。

创建生成器

生成器从不返回值，只是产出值。


    
        
            
                
                
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	[2] session_save_path(): open_basedir restriction in effect. File(/var/lib/php/session) is not within the allowed path(s): (/www/wwwroot/www.chaojiit.com/:/tmp/) /www/wwwroot/www.chaojiit.com/ThinkPHP/Common/functions.php 第 1239 行.
[8192] Array and string offset access syntax with curly braces is deprecated /www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 37 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 97 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 97 行.
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0.0505s