


PHP session implements multi-level directory storage implementation code_php skills
当一个目录下有很多文件时,服务器的处理性能会变低,php默认的session仅仅存放在/tmp目录下,未进行分级,当有一定的访问量时,就存在性能问题了。
首先,修改 php.ini的 session.save_path 选项修改如下:
session.save_path = “2;/tmp/session” (去掉前面分号)
表示把session存放在 “/tmp/session” 目录下,并且分成 2 级子目录
一般情况下2级目录就够了,就能够处理相当大的访问量了
———————–
其他注释
session.hash_function = 0
; 生成SID的散列算法。SHA-1的安全性更高一些
; 0: MD5 (128 bits)
; 1: SHA-1 (160 bits)
; 建议使用SHA-1。
session.hash_bits_per_character = 4
; 指定在SID字符串中的每个字符内保存多少bit,
; 这些二进制数是hash函数的运算结果。
; 4: 0-9, a-f
; 5: 0-9, a-v
; 6: 0-9, a-z, A-Z, “-“, “,”
; 建议值为 5
————————–
php源码文件中ext/session/mod_files.sh文件,可以辅助生成目录,就不用自己在写脚本了
#! /bin/sh if test "$2" = ""; then echo "usage: $0 basedir depth" exit 1 fi if test "$2" = "0"; then exit 0 fi hash_chars="0 1 2 3 4 5 6 7 8 9 a b c d e f" if test "$3" -a "$3" -ge "5"; then hash_chars="$hash_chars g h i j k l m n o p q r s t u v" if test "$3" -eq "6"; then hash_chars="$hash_chars w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z - ," fi fi for i in $hash_chars; do newpath="$1/$i" mkdir $newpath || exit 1 sh $0 $newpath `expr $2 - 1` $3 done
设置为可执行之后,运行以下命令来创建哈希目录:
#cd /root/soft_install/php-5.3.5/ext/session
#./mod_files.sh /tmp/session 2 5
三个参数依次表示,存放路径, 几级目录,每个目录生成多少个目录(参考session.hash_bits_per_character)
另外需要注意修改 /tmp/session的权限,保证运行php的帐号有权限读写

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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