Summary of string manipulation functions in PHP

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1. Find the character position function:

Strpos ($str, Search,[int])://Find search first position in $str starting with int; Strrpos ($STR, Search,[int])://Find search in $ The last occurrence in Str starts with an int

2. Extracting sub-character functions (double-byte)

Submit ($str, int start[,int length])://start extracting [length string] from $str in strat position. Strstr ($str 1, $str 2)://Search for $STR2 from $STR1 (first position) and intercept to end string from it, false if not. STRISTR ()//function with STRSTR, just not case sensitive. STRRCHR ()//prompt returned from the last word searched; use: Fetch the file name in the path

3. Replace string

Str_replace (Search,replace, $str): Find search from $STR replace str_irreplace with replace (Search,replace, $STR): Strtr ($STR, search Replace): Replace cannot be "" In this function, Substr_replace ($STR, $rep, $start [, length]) $str original string, $rep new string after replacement, $start start position, $ Length of the replacement, which is optional

4. Query string length

int strlen ($STR)

5. Compare character functions

int strcmp ($str 1, $str 2): $str 1>=< $str 2 are positive 1,0,-1 (string comparison strcasecmp () ditto (no Case strnatcmp ("4", "14") Compare strings by Natural sort strnatcasecmp () ibid. (Case-sensitive)

6. Dividing the array function

Str_split ($str, Len): Splits the $str by Len length return array split (search, $str [, int]): Splits the $str by the search character return array int is split several times, the back will not be split explode ( Search, $str [, int])

7, remove the space:

LTrim, RTrim, Trim

8, add the Space function

Chunk_split ($STR, 2); Add a space by 2 characters to the $STR character;

9. Returns the specified character or ASCII

Chr, Ord.

10. HTML code related functions

NL2BR (): Make \ n convert to <br>. Strip_tags ($str [, ' <p> '])://Remove HTML and PHP tags htmlspecialchars ($str [, Parameters])://page normal output HTML code parameter is the conversion mode

11. Character Case Conversion function

Strtolower ($STR) converts a string to lowercase strtoupper ($str) to uppercase Ucfirst ($STR) converts the first character of a function to uppercase ucwords ($STR) converts the first letter of each word to uppercase

12. Database related functions

Addslashes ($STR): Causes the single quotation mark ('), double quotation mark ("), backslash (\), and nul string in STR to be converted to \ ', \ ', \ \. MAGIC_QUOTES_GPC = on automatically escapes the contents of the Get post Cookie GET_MAGIC_QUOTES_GPC () detects if Magic_quotes_gpcstripslashes () is turned on to remove backslashes from the string

13. Connection function

Implode (str, $arr) concatenate a string array into a string by a specified character; the implode () function has an individual name function join