php--string Function Classification Summary

<span id="Label3"></p><p><p>String functions in the PHP language are also a relatively understandable knowledge. Today we summed up nearly 12 kinds of PHP string functions, I hope that the need for friends to help, increase the reader friend's PHP knowledge base.</p></p><p><p></p></p><p><p><strong>1. Find character position function</strong></p></p><p><p></p></p><p><p>Strpos ($str, search,[int]): Find the first position of search in $str starting with int;</p></p><p><p>Stripos ($str, search,[int]): function returns the position of the first occurrence of a string in another string. This function is not sensitive to case</p></p><p><p>Strrpos ($str, search,[int]): Find the last occurrence of search in $str from int</p></p><p><p></p></p><p><p><strong>2. Extracting sub-character functions (double-byte)</strong></p></p><p><p>Submit ($str, int Start[,int length]): extracts [length string] from strat position in $str.</p></p><p><p>Strstr ($str 1, $str 2): searches for $str2 from $STR1 (the first Position) and intercepts the end string from it, or False if None.</p></p><p><p>The Stristr () function is the same as strstr, but is not case Sensitive.</p></p><p><p>STRRCHR () prompt returned from the last word searched; use: fetch the file name in the path</p></p><p><p><strong>3. PHP string function to replace string</strong></p></p><p><p>Str_replace (search,replace, $str): Find search from $STR Replace with replace</p></p><p><p>Str_irreplace (search,replace, $str):</p></p><p><p>STRTR ($str, search,replace): Replace in this function cannot be "";</p></p><p><p>Substr_replace ($Str, $rep, $start [, length]) $str The original string, $rep replace the new</p></p><p><p>The string, $start start position, $length The length of the replacement, which is optional</p></p><p><p><strong>4. Character length</strong></p></p><p><p>int strlen ($str)</p></p><p><p><strong>5. Compare character functions</strong></p></p><p><p>int strcmp ($str 1, $str 2): $str 1&gt;=< $str 2 are positive 1,0,-1 (string Comparison)</p></p><p><p>strcasecmp () ditto (no Case)</p></p><p><p>STRNATCMP ("4", "14") Compare strings by natural sort</p></p><p><p>strnatcasecmp () ibid. (case sensitive)</p></p><p><p><strong>6. PHP String functions for splitting into groups</strong></p></p><p><p>Str_split ($str, len): splits the $STR by Len length returns the array</p></p><p><p>Split (search, $str [, int]): splits the $str by the search character returns the array int is split several times, the back will not be split</p></p><p><p>Expload (search, $str [, int])</p></p><p><p><strong>7, Remove the Space:</strong></p></p><p><p>ltrim, rtrim, Trim</p></p><p><p><strong>8, Add the Space function</strong></p></p><p><p>Chunk_split ($str, 2); Add a space by 2 characters to the $str character;</p></p><p><p><strong>9, chr, Ord--returns The specified character or ASCII</strong></p></p><p><p><strong>10. HTML Code related functions</strong></p></p><p><p>NL2BR (): make convert to &lt;br>.</p></p><p><p>Strip_tags ($str [, ¹<p>¹]): remove HTML and PHP tags</p></p><p><p>In $str all HTML and PHP code will be removed, and the optional parameters for HTML and PHP code will be preserved</p></p><p><p>The code that is written for the optional parameter.</p></p><p><p>Such as: Echo strip_tags ($text, ¹<br><p>¹);</p></p><p><p></p></p><p><p>Htmlspecialchars ($str [, parameters]): page Normal output HTML code parameter is the conversion mode</p></p><p><p><strong>11. Character-case-conversion PHP String functions</strong></p></p><p><p>Strtolower ($str) string converted to lowercase</p></p><p><p>Strtoupper ($str) string converted to uppercase</p></p><p><p>Ucfirst ($str) Converts the first character of a function to uppercase</p></p><p><p>Ucwords ($str) Converts the first letter of each word to uppercase</p></p><p><p><strong>12. database-related PHP String functions</strong></p></p><p><p>Addslashes ($str): makes the single quotation mark (¹), double quotation mark ("), backslash () and NUL in str</p></p><p><p>The string is converted to ¹, ", \.</p></p><p><p>MAGIC_QUOTES_GPC = on automatically escapes the contents of the Get post cookie</p></p><p><p>GET_MAGIC_QUOTES_GPC () detects if MAGIC_QUOTES_GPC is turned on</p></p><p><p>Stripslashes () to remove backslashes from a string</p></p><p><p></p></p><p><p>Article from: http://developer.51cto.com/art/200911/164634.htm</p></p><p><p>php--string Function Classification Summary</p></p></span>