


Summary of study notes PHP string processing functions_PHP tutorial
After a long period of development of PHP, many users are familiar with PHP. Here I will share my personal understanding of PHP string processing functions. I hope it will be helpful to everyone. PHP itself is a simple and powerful language.
Summary of PHP string processing functions:
<ol class="dp-xml"> <li class="alt"><span><span>addcslashes —— 为字符串里面的部分字符添加反斜线转义字符 </span></span></li> <li class=""><span>addslashes —— 用指定的方式对字符串里面的字符进行转义 </span></li> <li class="alt"><span>bin2hex —— 将二进制数据转换成十六进制表示 </span></li> <li class=""><span>chr —— 返回一个字符的ASCII码 </span></li> <li class="alt"><span>chunk_split —— 按一定的字符长度将字符串分割成小块 </span></li> <li class=""><span>convert_cyr_string —— 将斯拉夫语字符转换为别的字符 </span></li> <li class="alt"><span>convert_uudecode —— 解密一个字符串 </span></li> <li class=""><span>convert_uuencode —— 加密一个字符串 </span></li> <li class="alt"><span>count_chars —— 返回一个字符串里面的字符使用信息 </span></li> <li class=""><span>crc32 —— 计算一个字符串的crc32多项式 </span></li> <li class="alt"><span>crypt —— 单向散列加密函数 </span></li> <li class=""><span>explode —— 将一个字符串用分割符转变为一数组形式 </span></li> <li class="alt"><span>fprintf —— 按照要求对数据进行返回,并直接写入文档流 </span></li> <li class=""><span>get_html_translation_table —— 返回可以转换的HTML实体 </span></li> <li class="alt"><span>html_entity_decode —— htmlentities ()函数的反函数,将HTML实体转换为字符 </span></li> <li class=""><span>htmlentities —— 将字符串中一些字符转换为HTML实体 </span></li> <li class="alt"><span>htmlspecialchars_decode —— htmlspecialchars()函数的反函数,将HTML实体转换为字符 </span></li> <li class=""><span>htmlspecialchars —— 将字符串中一些字符转换为HTML实体 </span></li> <li class="alt"><span>implode —— 将数组用特定的分割符转变为字符串 </span></li> <li class=""><span>join —— 将数组转变为字符串,implode()函数的别名 </span></li> <li class="alt"><span>levenshtein —— 计算两个词的差别大小 </span></li> <li class=""><span>localeconv —— 获取数字相关的格式定义 </span></li> <li class="alt"><span>ltrim —— 去除字符串左侧的空白或者指定的字符 </span></li> <li class=""><span>md5_file —— 将一个文件进行MD5算法加密 </span></li> <li class="alt"><span>md5 —— 将一个字符串进行MD5算法加密 </span></li> <li class=""><span>metaphone —— 判断一个字符串的发音规则 </span></li> <li class="alt"><span>money_format —— 按照参数对数字进行格式化的输出 </span></li> <li class=""><span>nl_langinfo —— 查询语言和本地信息 </span></li> <li class="alt"><span>nl2br —— 将字符串中的换行符“n”替换成“ </span></li> <li class=""><span>” </span></li> <li class="alt"><span>number_format —— 按照参数对数字进行格式化的输出 </span></li> <li class=""><span>ord —— 将一个ASCII码转换为一个字符 </span></li> <li class="alt"><span>parse_str —— 把一定格式的字符串转变为变量和值 </span></li> <li class=""><span>print —— 用以输出一个单独的值 </span></li> <li class="alt"><span>printf —— 按照要求对数据进行显示 </span></li> <li class=""><span>quoted_printable_decode —— 将一个字符串加密为一个8位的二进制字符串 </span></li> <li class="alt"><span>quotemeta —— 对若干个特定字符进行转义 </span></li> <li class=""><span>rtrim —— 去除字符串右侧的空白或者指定的字符 </span></li> <li class="alt"><span>setlocale —— 设置关于数字,日期等等的本地格式 </span></li> <li class=""><span>sha1_file —— 将一个文件进行SHA1算法加密 </span></li> <li class="alt"><span>sha1 —— 将一个字符串进行SHA1算法加密 </span></li> <li class=""><span>similar_text —— 比较两个字符串,返回系统认为的相似字符个数 </span></li> <li class="alt"><span>soundex —— 判断一个字符串的发音规则 </span></li> <li class=""><span>sprintf —— 按照要求对数据进行返回,但是不输出 </span></li> <li class="alt"><span>sscanf —— 可以对字符串进行格式化 </span></li> <li class=""><span>str_ireplace —— 像str_replace()函数一样匹配和替换字符串,但是不区分大小写 </span></li> <li class="alt"><span>str_pad —— 对字符串进行两侧的补白 </span></li> <li class=""><span>str_repeat —— 对字符串进行重复组合 </span></li> <li class="alt"><span>str_replace —— 匹配和替换字符串 </span></li> <li class=""><span>str_rot13 —— 将字符串进行ROT13加密处理 </span></li> <li class="alt"><span>str_shuffle —— 对一个字符串里面的字符进行随机排序 </span></li> <li class=""><span>str_split —— 将一个字符串按照字符间距分割为一个数组 </span></li> <li class="alt"><span>str_word_count —— 获取字符串里面的英文单词信息 </span></li> <li class=""><span>strcasecmp —— 对字符串进行大小比较,不区分大小写 </span></li> <li class="alt"><span>strchr —— 通过比较返回一个字符串的部分strstr()函数的别名 </span></li> <li class=""><span>strcmp —— 对字符串进行大小比较 </span></li> <li class="alt"><span>strcoll – 根据本地设置对字符串进行大小比较 </span></li> <li class=""><span>strcspn —— 返回字符连续非匹配长度的值 </span></li> <li class="alt"><span>strip_tags —— 去除一个字符串里面的HTML和PHP代码 </span></li> <li class=""><span>stripcslashes —— 反转义addcslashes()函数转义处理过的字符串 </span></li> <li class="alt"><span>stripos —— 查找并返回首个匹配项的位置,匹配不区分大小写 </span></li> </ol>

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.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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