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>String 字符串处理函数</TITLE
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NAME="ref.strings"
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><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>CLXI. String 字符串处理函数</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN224362"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="strings.intro"
>简介</A
></H1
><P
> 本类函数用来对字符串进行各种操作。对字符串的一些其它专门操作，可以参考手册的正则表达式部分和
<A
HREF="ref.url.html"
>URL 操作</A
>部分。
</P
><P
> 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<A
HREF="language.types.html"
>类型</A
>部分中的<A
HREF="language.types.string.html"
>字符串</A
>条目。
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="strings.requirements"
>需求</A
></H1
><P
>要编译本扩展模块无需外部库文件。</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="strings.installation"
>安装</A
></H1
><P
>本扩展模块作为 PHP 内核的一部分，无需安装即可使用。</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="string.constants"
>预定义常量</A
></H1
><P
>以下常量由本扩展模块定义，因此只有在本扩展模块被编译到
PHP 中，或者在运行时被动态加载后才有效。</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>CRYPT_SALT_LENGTH</B
></TT
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>CRYPT_STD_DES</B
></TT
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>CRYPT_EXT_DES</B
></TT
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>CRYPT_MD5</B
></TT
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>CRYPT_BLOWFISH</B
></TT
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>HTML_SPECIALCHARS</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>HTML_ENTITIES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>ENT_COMPAT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>ENT_QUOTES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>ENT_NOQUOTES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>CHAR_MAX</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_CTYPE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_NUMERIC</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_TIME</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_COLLATE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_MONETARY</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_ALL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>LC_MESSAGES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>STR_PAD_LEFT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>STR_PAD_RIGHT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
><DT
><TT
CLASS="constant"
><B
>STR_PAD_BOTH</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
>
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="strings.seealso"
>参见</A
></H1
><P
> 如果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
<A
HREF="ref.regex.html"
>POSIX 扩展正则表达式函数</A
>和
<A
HREF="ref.pcre.html"
>Perl 兼容正则表达式函数</A
>部分。
</P
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>目录</B
></DT
><DT
><A
HREF="function.addcslashes.html"
>addcslashes</A
> -- 以 C 语言风格使用反斜线转义字符串中的字符</DT
><DT
><A
HREF="function.addslashes.html"
>addslashes</A
> -- 使用反斜线引用字符串</DT
><DT
><A
HREF="function.bin2hex.html"
>bin2hex</A
> -- 将二进制数据转换成十六进制表示</DT
><DT
><A
HREF="function.chop.html"
>chop</A
> -- <A
HREF="function.rtrim.html"
><B
CLASS="function"
>rtrim()</B
></A
> 的别名</DT
><DT
><A
HREF="function.chr.html"
>chr</A
> -- 返回指定的字符</DT
><DT
><A
HREF="function.chunk-split.html"
>chunk_split</A
> -- 将字符串分割成小块</DT
><DT
><A
HREF="function.convert-cyr-string.html"
>convert_cyr_string</A
> -- 将字符由一种 Cyrillic 字符转换成另一种</DT
><DT
><A
HREF="function.convert-uudecode.html"
>convert_uudecode</A
> --
Decode a uuencoded string
</DT
><DT
><A
HREF="function.convert-uuencode.html"
>convert_uuencode</A
> --
Uuencode a string
</DT
><DT
><A
HREF="function.count-chars.html"
>count_chars</A
> -- 返回字符串所用字符的信息</DT
><DT
><A
HREF="function.crc32.html"
>crc32</A
> -- 计算一个字符串的 crc32 多项式</DT
><DT
><A
HREF="function.crypt.html"
>crypt</A
> -- One-way string encryption (hashing)</DT
><DT
><A
HREF="function.echo.html"
>echo</A
> -- Output one or more strings</DT
><DT
><A
HREF="function.explode.html"
>explode</A
> -- 使用一个字符串分割另一个字符串</DT
><DT
><A
HREF="function.fprintf.html"
>fprintf</A
> -- Write a formatted string to a stream</DT
><DT
><A
HREF="function.get-html-translation-table.html"
>get_html_translation_table</A
> --
Returns the translation table used by
<A
HREF="function.htmlspecialchars.html"
><B
CLASS="function"
>htmlspecialchars()</B
></A
> and
<A
HREF="function.htmlentities.html"
><B
CLASS="function"
>htmlentities()</B
></A
>
</DT
><DT
><A
HREF="function.hebrev.html"
>hebrev</A
> --
Convert logical Hebrew text to visual text
</DT
><DT
><A
HREF="function.hebrevc.html"
>hebrevc</A
> --
Convert logical Hebrew text to visual text with newline conversion
</DT
><DT
><A
HREF="function.html-entity-decode.html"
>html_entity_decode</A
> --
Convert all HTML entities to their applicable characters
</DT
><DT
><A
HREF="function.htmlentities.html"
>htmlentities</A
> --
Convert all applicable characters to HTML entities
</DT
><DT
><A
HREF="function.htmlspecialchars-decode.html"
>htmlspecialchars_decode</A
> --
Convert special HTML entities back to characters
</DT
><DT
><A
HREF="function.htmlspecialchars.html"
>htmlspecialchars</A
> --
Convert special characters to HTML entities
</DT
><DT
><A
HREF="function.implode.html"
>implode</A
> -- Join array elements with a string</DT
><DT
><A
HREF="function.join.html"
>join</A
> -- 别名 <A
HREF="function.implode.html"
><B
CLASS="function"
>implode()</B
></A
></DT
><DT
><A
HREF="function.levenshtein.html"
>levenshtein</A
> --
Calculate Levenshtein distance between two strings
</DT
><DT
><A
HREF="function.localeconv.html"
>localeconv</A
> -- Get numeric formatting information</DT
><DT
><A
HREF="function.ltrim.html"
>ltrim</A
> --
Strip whitespace (or other characters) from the beginning of a string
</DT
><DT
><A
HREF="function.md5-file.html"
>md5_file</A
> -- Calculates the md5 hash of a given file</DT
><DT
><A
HREF="function.md5.html"
>md5</A
> -- Calculate the md5 hash of a string</DT
><DT
><A
HREF="function.metaphone.html"
>metaphone</A
> -- Calculate the metaphone key of a string</DT
><DT
><A
HREF="function.money-format.html"
>money_format</A
> -- Formats a number as a currency string</DT
><DT
><A
HREF="function.nl-langinfo.html"
>nl_langinfo</A
> --
Query language and locale information
</DT
><DT
><A
HREF="function.nl2br.html"
>nl2br</A
> --
Inserts HTML line breaks before all newlines in a string
</DT
><DT
><A
HREF="function.number-format.html"
>number_format</A
> -- Format a number with grouped thousands</DT
><DT
><A
HREF="function.ord.html"
>ord</A
> -- Return ASCII value of character</DT
><DT
><A
HREF="function.parse-str.html"
>parse_str</A
> -- Parses the string into variables</DT
><DT
><A
HREF="function.print.html"
>print</A
> -- Output a string</DT
><DT
><A
HREF="function.printf.html"
>printf</A
> -- Output a formatted string</DT
><DT
><A
HREF="function.quoted-printable-decode.html"
>quoted_printable_decode</A
> --
Convert a quoted-printable string to an 8 bit string
</DT
><DT
><A
HREF="function.quotemeta.html"
>quotemeta</A
> -- Quote meta characters</DT
><DT
><A
HREF="function.rtrim.html"
>rtrim</A
> --
Strip whitespace (or other characters) from the end of a string
</DT
><DT
><A
HREF="function.setlocale.html"
>setlocale</A
> -- Set locale information</DT
><DT
><A
HREF="function.sha1-file.html"
>sha1_file</A
> -- Calculate the sha1 hash of a file</DT
><DT
><A
HREF="function.sha1.html"
>sha1</A
> -- Calculate the sha1 hash of a string</DT
><DT
><A
HREF="function.similar-text.html"
>similar_text</A
> --
Calculate the similarity between two strings
</DT
><DT
><A
HREF="function.soundex.html"
>soundex</A
> -- Calculate the soundex key of a string</DT
><DT
><A
HREF="function.sprintf.html"
>sprintf</A
> -- Return a formatted string</DT
><DT
><A
HREF="function.sscanf.html"
>sscanf</A
> --
Parses input from a string according to a format
</DT
><DT
><A
HREF="function.str-getcsv.html"
>str_getcsv</A
> --
Parse a CSV string into an array
</DT
><DT
><A
HREF="function.str-ireplace.html"
>str_ireplace</A
> --
Case-insensitive version of <A
HREF="function.str-replace.html"
><B
CLASS="function"
>str_replace()</B
></A
>.
</DT
><DT
><A
HREF="function.str-pad.html"
>str_pad</A
> --
Pad a string to a certain length with another string
</DT
><DT
><A
HREF="function.str-repeat.html"
>str_repeat</A
> -- Repeat a string</DT
><DT
><A
HREF="function.str-replace.html"
>str_replace</A
> --
Replace all occurrences of the search string with the replacement string
</DT
><DT
><A
HREF="function.str-rot13.html"
>str_rot13</A
> -- Perform the rot13 transform on a string</DT
><DT
><A
HREF="function.str-shuffle.html"
>str_shuffle</A
> -- Randomly shuffles a string</DT
><DT
><A
HREF="function.str-split.html"
>str_split</A
> --
Convert a string to an array
</DT
><DT
><A
HREF="function.str-word-count.html"
>str_word_count</A
> --
Return information about words used in a string
</DT
><DT
><A
HREF="function.strcasecmp.html"
>strcasecmp</A
> --
Binary safe case-insensitive string comparison
</DT
><DT
><A
HREF="function.strchr.html"
>strchr</A
> -- 别名 <A
HREF="function.strstr.html"
><B
CLASS="function"
>strstr()</B
></A
></DT
><DT
><A
HREF="function.strcmp.html"
>strcmp</A
> -- Binary safe string comparison</DT
><DT
><A
HREF="function.strcoll.html"
>strcoll</A
> -- Locale based string comparison</DT
><DT
><A
HREF="function.strcspn.html"
>strcspn</A
> --
Find length of initial segment not matching mask
</DT
><DT
><A
HREF="function.strip-tags.html"
>strip_tags</A
> -- Strip HTML and PHP tags from a string</DT
><DT
><A
HREF="function.stripcslashes.html"
>stripcslashes</A
> --
Un-quote string quoted with <A
HREF="function.addcslashes.html"
><B
CLASS="function"
>addcslashes()</B
></A
>
</DT
><DT
><A
HREF="function.stripos.html"
>stripos</A
> --
Find position of first occurrence of a case-insensitive string
</DT
><DT
><A
HREF="function.stripslashes.html"
>stripslashes</A
> --
Un-quote string quoted with <A
HREF="function.addslashes.html"
><B
CLASS="function"
>addslashes()</B
></A
>
</DT
><DT
><A
HREF="function.stristr.html"
>stristr</A
> --
Case-insensitive <A
HREF="function.strstr.html"
><B
CLASS="function"
>strstr()</B
></A
>
</DT
><DT
><A
HREF="function.strlen.html"
>strlen</A
> -- Get string length</DT
><DT
><A
HREF="function.strnatcasecmp.html"
>strnatcasecmp</A
> --
Case insensitive string comparisons using a "natural order"
algorithm
</DT
><DT
><A
HREF="function.strnatcmp.html"
>strnatcmp</A
> --
String comparisons using a "natural order" algorithm
</DT
><DT
><A
HREF="function.strncasecmp.html"
>strncasecmp</A
> --
Binary safe case-insensitive string comparison of the first n
characters
</DT
><DT
><A
HREF="function.strncmp.html"
>strncmp</A
> --
Binary safe string comparison of the first n characters
</DT
><DT
><A
HREF="function.strpbrk.html"
>strpbrk</A
> --
Search a string for any of a set of characters
</DT
><DT
><A
HREF="function.strpos.html"
>strpos</A
> --
Find position of first occurrence of a string
</DT
><DT
><A
HREF="function.strrchr.html"
>strrchr</A
> --
Find the last occurrence of a character in a string
</DT
><DT
><A
HREF="function.strrev.html"
>strrev</A
> -- Reverse a string</DT
><DT
><A
HREF="function.strripos.html"
>strripos</A
> --
Find position of last occurrence of a case-insensitive string in a string
</DT
><DT
><A
HREF="function.strrpos.html"
>strrpos</A
> --
Find position of last occurrence of a char in a string
</DT
><DT
><A
HREF="function.strspn.html"
>strspn</A
> --
Find length of initial segment matching mask
</DT
><DT
><A
HREF="function.strstr.html"
>strstr</A
> -- Find first occurrence of a string</DT
><DT
><A
HREF="function.strtok.html"
>strtok</A
> -- Tokenize string</DT
><DT
><A
HREF="function.strtolower.html"
>strtolower</A
> -- Make a string lowercase</DT
><DT
><A
HREF="function.strtoupper.html"
>strtoupper</A
> -- Make a string uppercase</DT
><DT
><A
HREF="function.strtr.html"
>strtr</A
> -- Translate certain characters</DT
><DT
><A
HREF="function.substr-compare.html"
>substr_compare</A
> --
Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters
</DT
><DT
><A
HREF="function.substr-count.html"
>substr_count</A
> -- Count the number of substring occurrences</DT
><DT
><A
HREF="function.substr-replace.html"
>substr_replace</A
> -- Replace text within a portion of a string</DT
><DT
><A
HREF="function.substr.html"
>substr</A
> -- Return part of a string</DT
><DT
><A
HREF="function.trim.html"
>trim</A
> -- Strip whitespace (or other characters) from the beginning and end of a string</DT
><DT
><A
HREF="function.ucfirst.html"
>ucfirst</A
> -- Make a string's first character uppercase</DT
><DT
><A
HREF="function.ucwords.html"
>ucwords</A
> --
Uppercase the first character of each word in a string
</DT
><DT
><A
HREF="function.vfprintf.html"
>vfprintf</A
> -- Write a formatted string to a stream</DT
><DT
><A
HREF="function.vprintf.html"
>vprintf</A
> -- Output a formatted string</DT
><DT
><A
HREF="function.vsprintf.html"
>vsprintf</A
> -- Return a formatted string</DT
><DT
><A
HREF="function.wordwrap.html"
>wordwrap</A
> --
Wraps a string to a given number of characters using a string
break character
</DT
></DL
></DIV
></DIV
></DIV
><DIV
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ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="function.stream-wrapper-unregister.html"
ACCESSKEY="P"
>上一页</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>起始页</A
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><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.addcslashes.html"
ACCESSKEY="N"
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></TD
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><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>stream_wrapper_unregister</TD
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WIDTH="34%"
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VALIGN="top"
><A
HREF="funcref.html"
ACCESSKEY="U"
>上一级</A
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