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PHP String 
PHP String Introduction
PHP字符串介绍
The string functions allow you to manipulate strings.
本类函数用来对字符串进行各种操作。
Installation
安装
The string functions are part of the PHP core. There is no installation needed to use these functions.
本函数库作为 PHP 内核的一部分，不用安装就能使用。
PHP String Functions
PHP字符串函数
PHP: indicates the earliest version of PHP that supports the function.
PHP：最早支持这些函数的PHP版本
| Function函数 | Description说明 | PHP |
|---|---|---|
| addcslashes() | Returns a string with backslashes in front of the specified characters 像 C 那样使用反斜线转义字符串中的字符 |
4 |
| addslashes() | Returns a string with backslashes in front of predefined characters 使用反斜线引用字符串 |
3 |
| bin2hex() | Converts a string of ASCII characters to hexadecimal values 将二进制数据转换成十六进制表示 |
3 |
| chop() | Alias of rtrim() rtrim() 的别名函数 |
3 |
| chr() | Returns a character from a specified ASCII value 返回指定的字符 |
3 |
| chunk_split() | Splits a string into a series of smaller parts 将字符串分割成小块 |
3 |
| convert_cyr_string() | Converts a string from one Cyrillic character-set to another 将字符由一种 Cyrillic 字符转换成另一种 |
3 |
| convert_uudecode() | Decodes a uuencoded string 对用uuencode算法编码的字符串解码 |
5 |
| convert_uuencode() | Encodes a string using the uuencode algorithm 用uuencode算法对字符串编码 |
5 |
| count_chars() | Returns how many times an ASCII character occurs within a string and returns the information 返回字符串所用字符的信息 |
4 |
| crc32() | Calculates a 32-bit CRC for a string 计算一个字符串的 crc32 多项式 |
4 |
| crypt() | One-way string encryption (hashing) 不可逆加密（散列） |
3 |
| echo() | Outputs strings 输出字符串 |
3 |
| explode() | Breaks a string into an array 使用一个字符串分割另一个字符串 |
3 |
| fprintf() | Writes a formatted string to a specified output stream 输出格式化字符串到流 将格式化后的字符串写到输出流 |
5 |
| get_html_translation_table() | Returns the translation table used by htmlspecialchars() and htmlentities() 返回htmlspecialchars()和htmlentities()的转换表 |
4 |
| hebrev() | Converts Hebrew text to visual text 转换希伯来语文本为可见文本 |
3 |
| hebrevc() | Converts Hebrew text to visual text and new lines (n) into <br /> 转换希伯来语文本为可见文本，换行 (n) 为 <br /> |
3 |
| html_entity_decode() | Converts HTML entities to characters 转换HTML字符编码为字符 |
4 |
| htmlentities() | Converts characters to HTML entities 转换字符为HTML字符编码 |
3 |
| htmlspecialchars_decode() | Converts some predefined HTML entities to characters 转换特殊HTML字符编码为字符 |
5 |
| htmlspecialchars() | Converts some predefined characters to HTML entities 转换特殊字符为HTML字符编码 |
3 |
| implode() | Returns a string from the elements of an array 将数组元素组合为字符串输出 |
3 |
| join() | Alias of implode() 别名 implode() |
3 |
| levenshtein() | Returns the Levenshtein distance between two strings 计算两个字符串的Levenshtein距离 |
3 |
| localeconv() | Returns locale numeric and monetary formatting information 返回当地的数字和货币格式信息 |
4 |
| ltrim() | Strips whitespace from the left side of a string 去除字符串左端的空白（或其它字符） |
3 |
| md5() | Calculates the MD5 hash of a string 计算字符串的MD5 hash |
3 |
| md5_file() | Calculates the MD5 hash of a file 计算文件的MD5 hash |
4 |
| metaphone() | Calculates the metaphone key of a string 计算字符串的metaphone 键 |
4 |
| money_format() | Returns a string formatted as a currency string 将数字格式化为货币形式 |
4 |
| nl_langinfo() | Returns specific local information 获取语言及本地信息 |
4 |
| nl2br() | Inserts HTML line breaks in front of each newline in a string 在字符串的每个新行前插入HTML换行标志 |
3 |
| number_format() | Formats a number with grouped thousands 用千位分隔符号格式化数字 |
3 |
| ord() | Returns the ASCII value of the first character of a string 返回字符串中首字符的ASCII码值 |
3 |
| parse_str() | Parses a query string into variables 将字串符解析为变量 |
3 |
| print() | Outputs a string 输出字符串 |
3 |
| printf() | Outputs a formatted string 输出格式化字符串 |
3 |
| quoted_printable_decode() | Decodes a quoted-printable string 转换quoted-printable字符串为8位字符串 |
3 |
| quotemeta() | Quotes meta characters 转义字符串中的meta字符 |
3 |
| rtrim() |
Strips whitespace from the right side of a string |
3 |
| setlocale() | Sets locale information 设置本化信息 |
3 |
| sha1() | Calculates the SHA-1 hash of a string 计算字符串的SHA-1 hash |
4 |
| sha1_file() | Calculates the SHA-1 hash of a file 计算文件的SHA-1 hash |
4 |
| similar_text() | Calculates the similarity between two strings 计算两个字符串的相似性 |
3 |
| soundex() | Calculates the soundex key of a string 计算字符串的soundx key |
3 |
| sprintf() | Writes a formatted string to a variable 输出格式化字符串到变量 |
3 |
| sscanf() | Parses input from a string according to a format 按照一定格式解析输入的字符串 |
4 |
| str_ireplace() | Replaces some characters in a string (case-insensitive) 大小写不敏感的str_replace(). |
5 |
| str_pad() | Pads a string to a new length 用一个字符串填充另一个字符串到指定长度 |
4 |
| str_repeat() | Repeats a string a specified number of times 重复字符串 |
4 |
| str_replace() | Replaces some characters in a string (case-sensitive) 将某个子字符串都替换为另一个字符串（大小写敏感） |
3 |
| str_rot13() | Performs the ROT13 encoding on a string 对字符串作ROT13编码 |
4 |
| str_shuffle() | Randomly shuffles all characters in a string 随机打乱字符串中的字符顺序 |
4 |
| str_split() | Splits a string into an array 转换字符串为数组 |
5 |
| str_word_count() | Count the number of words in a string 计算字符串中的词数 |
4 |
| strcasecmp() | Compares two strings (case-insensitive) 比较两个字符串（大小写不敏感） |
3 |
| strchr() | Finds the first occurrence of a string inside another string (alias of strstr()) 别名 strstr() |
3 |
| strcmp() | Compares two strings (case-sensitive) 比较两个字符串（大小写敏感） |
3 |
| strcoll() | Locale based string comparison 基于本地的字符串比较 |
4 |
| strcspn() | Returns the number of characters found in a string before any part of some specified characters are found 返回字符串中起首不符合mask的子字符串长度 |
3 |
| strip_tags() | Strips HTML and PHP tags from a string 除去字符串中的HTML和PHP标签 |
3 |
| stripcslashes() | Unquotes a string quoted with addcslashes() 将用addcslashes()处理后的字符串返回原样 |
4 |
| stripslashes() | Unquotes a string quoted with addslashes() 将用addslashes()处理后的字符串返回原样 |
3 |
| stripos() | Returns the position of the first occurrence of a string inside another string (case-insensitive) 查找一个字符串在另一个字符串中首次出现的位置（大小写不敏感） |
5 |
| stristr() | Finds the first occurrence of a string inside another string (case-insensitive) 大小写不敏感的strstr() |
3 |
| strlen() | Returns the length of a string 字符串长度 |
3 |
| strnatcasecmp() | Compares two strings using a "natural order" algorithm (case-insensitive) 用natural order算法比较字符串（大小写不敏感） |
4 |
| strnatcmp() | Compares two strings using a "natural order" algorithm (case-sensitive) 用natural order算法比较字符串（大小写敏感） |
4 |
| strncasecmp() | String comparison of the first n characters (case-insensitive) 比较字符串的前n个字符（大小写不敏感） |
4 |
| strncmp() | String comparison of the first n characters (case-sensitive) 比较字符串的前n个字符（大小写敏感） |
4 |
| strpbrk() | Searches a string for any of a set of characters 查找字符串中的一系列字符 |
5 |
| strpos() | Returns the position of the first occurrence of a string inside another string (case-sensitive) 查找一个字符串在另一个字符串中首次出现的位置（大小写敏感） |
3 |
| strrchr() | Finds the last occurrence of a string inside another string 查找一个字符串在另一个字符串中末次出现的位置 |
3 |
| strrev() | Reverses a string 倒转字符串 |
3 |
| strripos() | Finds the position of the last occurrence of a string inside another string (case-insensitive) 查找一个字符串在另一个字符串中末次出现的位置（大小写不敏感） |
5 |
| strrpos() | Finds the position of the last occurrence of a string inside another string (case-sensitive) 查找一个字符串在另一个字符串中末次出现的位置（大小写敏感） |
3 |
| strspn() | Returns the number of characters found in a string that contains only characters from a specified charlist 返回字符串中起首符合mask的子字符串长度 |
3 |
| strstr() | Finds the first occurrence of a string inside another string (case-sensitive) 返回一个字符串在另一个字符串中首次出现的位置到后者末尾的子字符串（大小写敏感） |
3 |
| strtok() | Splits a string into smaller strings 将字符串分割成小块 |
3 |
| strtolower() | Converts a string to lowercase letters 转为小写字母 |
3 |
| strtoupper() | Converts a string to uppercase letters 转为大写字母 |
3 |
| strtr() | Translates certain characters in a string 转换字串中一些字母 |
3 |
| substr() | Returns a part of a string 返回子字串 |
3 |
| substr_compare() | Compares two strings from a specified start position (binary safe and optionally case-sensitive) 从一定起始位置在一定长度内比较两个字串符（二进制精确，大小写敏感可选） |
5 |
| substr_count() | Counts the number of times a substring occurs in a string 查找子字符串出现次数 |
4 |
| substr_replace() | Replaces a part of a string with another string 替换字符串中一部分为另一字符串 |
4 |
| trim() | Strips whitespace from both sides of a string 去除字符串首末尾的空白（或其它字符） |
3 |
| ucfirst() | Converts the first character of a string to uppercase 字符串首字母大写 |
3 |
| ucwords() | Converts the first character of each word in a string to uppercase 字符串中每个词的首字母大写 |
3 |
| vfprintf() | Writes a formatted string to a specified output stream 输出格式化字符串到流 |
5 |
| vprintf() | Outputs a formatted string 输出格式化字符串 |
4 |
| vsprintf() | Writes a formatted string to a variable 输出格式化字符串到变量 |
4 |
| wordwrap() | Wraps a string to a given number of characters 将字符串按字符个数换行 |
4 |
PHP String Constants
PHP字符串常量
PHP: indicates the earliest version of PHP that supports the constant.
PHP：最早支持这些常量的PHP版本
| Constant常量 | Description说明 | PHP |
|---|---|---|
| CRYPT_SALT_LENGTH | Contains the length of the default encryption method for the system. For standard DES encryption, the length is 2 包含系统使用的默认加密编码长度。默认长度为2 |
|
| CRYPT_STD_DES | Set to 1 if the standard DES-based encryption with a 2 character salt is supported, 0 otherwise 如果支持基于DES的2位字符加密编码，那么该常量设置为1；否则设置为0 |
|
| CRYPT_EXT_DES | Set to 1 if the extended DES-based encryption with a 9 character salt is supported, 0 otherwise 如果支持基于DES的9位字符加密编码，那么该常量设置为1；否则设置为0 |
|
| CRYPT_MD5 |
Set to 1 if the MD5 encryption with a 12 character salt starting with $1$ is supported, 0 otherwise |
|
| CRYPT_BLOWFISH | Set to 1 if the Blowfish encryption with a 16 character salt starting with $2$ or $2a$ is supported, 0 otherwise0 如果支持Blowfish的16位字符加密编码，并且该加密编码以 $2$ 或$2a$起始，则将该常量设置为1；否则设置为0 |
|
| HTML_SPECIALCHARS | ||
| HTML_ENTITIES | ||
| ENT_COMPAT | ||
| ENT_QUOTES | ||
| ENT_NOQUOTES | ||
| CHAR_MAX | ||
| LC_CTYPE | ||
| LC_NUMERIC | ||
| LC_TIME | ||
| LC_COLLATE | ||
| LC_MONETARY | ||
| LC_ALL | ||
| LC_MESSAGES | ||
| STR_PAD_LEFT | ||
| STR_PAD_RIGHT | ||
| STR_PAD_BOTH |
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