CVI. 字符串处理函数库

介绍

本函数库中的函数用来对字符串进行各种操作。对字符串其它的一些专门操作,可以参考手册的正则表达式部分和 URL 操作 部分.

如果想要了解字符串的相关内容,特别是有关单引号,双引号等的处理部分,可以参考手册中 类型 部分中的 字符串 条目。

需求

无需外部库文件就可以加入本扩展模块的支持。

安装

这些函数作为 PHP 核心的一部分,无需被安装即可使用。

预定义常量

由于这些常量是由该扩展模块定义的,因此只有在该扩展模块被编译到 PHP 中,或者在运行时被动态加载后,这些常量才有效。

CRYPT_SALT_LENGTH integer

CRYPT_STD_DES integer

CRYPT_EXT_DES integer

CRYPT_MD5 integer

CRYPT_BLOWFISH integer

HTML_SPECIALCHARS (integer)

HTML_ENTITIES (integer)

ENT_COMPAT (integer)

ENT_QUOTES (integer)

ENT_NOQUOTES (integer)

CHAR_MAX (integer)

LC_CTYPE (integer)

LC_NUMERIC (integer)

LC_TIME (integer)

LC_COLLATE (integer)

LC_MONETARY (integer)

LC_ALL (integer)

LC_MESSAGES (integer)

STR_PAD_LEFT (integer)

STR_PAD_RIGHT (integer)

STR_PAD_BOTH (integer)

相关参考

如果您想更深入的了解有关字符串高级操作的相关内容,请参阅手册的 正则表达式函数Perl 兼容函数 部分.

目录
addcslashes -- Quote string with slashes in a C style
addslashes -- Quote string with slashes
bin2hex --  Convert binary data into hexadecimal representation
chop -- Alias of rtrim()
chr -- Return a specific character
chunk_split -- Split a string into smaller chunks
convert_cyr_string --  Convert from one Cyrillic character set to another
count_chars --  Return information about characters used in a string
crc32 -- Calculates the crc32 polynomial of a string
crypt -- One-way string encryption (hashing)
echo -- Output one or more strings
explode -- Split a string by string
fprintf -- Write a formatted string to a stream
get_html_translation_table --  Returns the translation table used by htmlspecialchars() and htmlentities()
hebrev --  Convert logical Hebrew text to visual text
hebrevc --  Convert logical Hebrew text to visual text with newline conversion
html_entity_decode --  Convert all HTML entities to their applicable characters
htmlentities --  Convert all applicable characters to HTML entities
htmlspecialchars --  Convert special characters to HTML entities
implode -- Join array elements with a string
join -- Alias of implode()
levenshtein --  Calculate Levenshtein distance between two strings
localeconv -- Get numeric formatting information
ltrim --  Strip whitespace from the beginning of a string
md5_file -- Calculates the md5 hash of a given filename
md5 -- Calculate the md5 hash of a string
metaphone -- Calculate the metaphone key of a string
money_format -- Formats a number as a currency string
nl_langinfo --  Query language and locale information
nl2br --  Inserts HTML line breaks before all newlines in a string
number_format -- Format a number with grouped thousands
ord -- Return ASCII value of character
parse_str -- Parses the string into variables
print -- Output a string
printf -- Output a formatted string
quoted_printable_decode --  Convert a quoted-printable string to an 8 bit string
quotemeta -- Quote meta characters
rtrim --  Strip whitespace from the end of a string
setlocale -- Set locale information
sha1_file -- Calculate the sha1 hash of a file
sha1 -- Calculate the sha1 hash of a string
similar_text --  Calculate the similarity between two strings
soundex -- Calculate the soundex key of a string
sprintf -- Return a formatted string
sscanf --  Parses input from a string according to a format
str_ireplace --  Case-insensitive version of str_replace().
str_pad --  Pad a string to a certain length with another string
str_repeat -- Repeat a string
str_replace --  Replace all occurrences of the search string with the replacement string
str_rot13 -- Perform the rot13 transform on a string
str_shuffle -- Randomly shuffles a string
str_split --  Convert a string to an array
str_word_count --  Return information about words used in a string
strcasecmp --  Binary safe case-insensitive string comparison
strchr -- Alias of strstr()
strcmp -- Binary safe string comparison
strcoll -- Locale based string comparison
strcspn --  Find length of initial segment not matching mask
strip_tags -- Strip HTML and PHP tags from a string
stripcslashes --  Un-quote string quoted with addcslashes()
stripos --  Find position of first occurrence of a case-insensitive string
stripslashes --  Un-quote string quoted with addslashes()
stristr --  Case-insensitive strstr()
strlen -- Get string length
strnatcasecmp --  Case insensitive string comparisons using a "natural order" algorithm
strnatcmp --  String comparisons using a "natural order" algorithm
strncasecmp --  Binary safe case-insensitive string comparison of the first n characters
strncmp --  Binary safe string comparison of the first n characters
strpos --  Find position of first occurrence of a string
strrchr --  Find the last occurrence of a character in a string
strrev -- Reverse a string
strripos --  Find position of last occurrence of a case-insensitive string in a string
strrpos --  Find position of last occurrence of a char in a string
strspn --  Find length of initial segment matching mask
strstr -- Find first occurrence of a string
strtok -- Tokenize string
strtolower -- Make a string lowercase
strtoupper -- Make a string uppercase
strtr -- Translate certain characters
substr_compare --  Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters
substr_count -- Count the number of substring occurrences
substr_replace -- Replace text within a portion of a string
substr -- Return part of a string
trim --  Strip whitespace from the beginning and end of a string
ucfirst -- Make a string's first character uppercase
ucwords --  Uppercase the first character of each word in a string
vprintf -- Output a formatted string
vsprintf -- Return a formatted string
wordwrap --  Wraps a string to a given number of characters using a string break character.