Summary of common string usage in php

Summary of common string usage in php

Echo implode (",", array ('lastname', 'Email ', 'phone'); // Convert the array to a string Explode: Print_r (explode (",", 'lastname, email, phone'); // convert a string to an array Split: Print_r (split ("[/.-]", "2008-9.12"); // cut the string into an array with a sign of "/" or "." or "-" Str_split: Print_r (str_split ("Hello Friend", 1); // cut the string Preg_split: // Regular expression segmentation // $ Ops = preg_split ("{[+ */-]}", "3 + 5*9/2 "); // Print_r ($ ops); // return: Array ([0] => 3 [1] => 5 [2] => 9 [3] => 2) Http_build_query: // Generate the request string after url-encoded $ Data = array ('localhost' => 'A ', 'User' => 'BB ', 'Password' => 'CC '); Echo http_build_query ($ data); // return: localhost = aa & user = bb & password = cc Strtok: // Cut the string into segments $ String = "This is \ tan example \ nstring "; Echo strtok ($ string, "\ n \ t"); // return: This is Echo ''; Echo strtok ("\ n \ t"); // when the second return: an example Echo ''; Echo strtok ("\ n \ t"); // when the third return: string 2. many search and replace strings are r: final, I: case-insensitive Echo $ pos = strpos ('abcdef abcdaef ', 'A'); // The location where the first letter a appears, Case Sensitive Echo $ pos = strrpos ('abcdef abcdeaf', 'A'); // The last occurrence location of letter a, Case Sensitive Stripos: case-insensitive strripos: case-insensitive Echo strstr ('User @ exa@mple.com ',' @ '); // return: @ exa@mple.com Stristr: case insensitive Echo strchr ('User @ exa@mple.com ',' @ '); // return: @ exa@mple.com Strrchr: returns @ mple.com, Preg_grep: // Returns the array unit that matches the pattern. $ Food = preg_grep ("/^ p/", array ("apple", "orange", "pip", "banana ")); Print_r ($ food); // return: Array ([2] => pip) Strtr: // Replace the string with the specified array $ Arr = array ("www" => "ftp", "yahoo" => "baidu "); Echo strtr ("www.yahoo.com", $ arr); // return value: ftp.baidu.com Echo strtr ("www.yahoo.com", "wo", "sx"); // return: sss. yahxx. cxm translation string replace all w with s and replace all o with x Strspns: // Find the length of the first part Echo strspn ("abcdefg", "1234567890"); // return value: 0 // Find the length of the initial part that is not compared Echo strcspn ("abcdefg", "1234567890"); // return value: 7 3. string regular match preg_match: // Returns the number of times that pattern matches. Either 0 (no match) or 1 time, because preg_match () will stop searching after the first match. If (preg_match ("/php/I", "PhP is the web scripting language of choice .")) Echo "exists "; Else Echo "does not exist "; Preg_match_all: // On the contrary, the end of the subject will be searched all the time. Preg_match_all ("/\(? (\ D {3 })? \)? (? (1) [\-\ s]) \ d {3}-\ d {4}/x ", "Call 555-1212 or 1-800-555-1212", $ phones ); Print_r ($ phones [0]); // Obtain all phone numbers Ereg_replace: // Replace the URL with the hyperconnection Echo ereg_replace ("[[: alpha:] +: // [^ <> [: space:] + [[: alnum:]/]", "\ 0", 'this is Baidu http://www.baidu.com website. '); Preg_replace: filter $ Search = array ("' ] *?>. *? Script 'Si ", // remove javascript "'<[\/\!] *? [^ <>] *?> 'Si ", // remove the HTML tag "'([\ R \ n]) [\ s] +'", // remove the white space "'& (Quot | #34);' I", // replaces the HTML object "'& (Amp | #38);' I ", "'& (Lt | #60);' I ", "'& (Gt | #62);' I ", "'& (Nbsp | #160);' I ", "'& (Iexcl | #161);' I ", "'& (Cent | #162);' I ", "'& (Pound | #163);' I ", "'& (Copy | #169);' I ", "'& # (\ D +); 'e"); // run as PHP code $ Replace = array ("", "", "\ 1 ", "\"", "&", "<", "> ", "", Chr (1, 161 ), Chr (1, 162 ), Chr (1, 163 ), Chr (1, 169 ), "Chr (\ 1 )"); Echo $ text = preg_replace ($ search, $ replace ,'TestScript alert ("adfasdf"); script '); Preg_quote: // Escape the regular expression character. add \ to each character to conform to the regular expression. Echo preg_quote ('$40 for a g3/100','/'); // return: \ $40 for a g3 \/400 SQL _regcase: // Generate a regular expression for matching with no difference in size Echo SQL _regcase ("Foo-bar.a"); // return: [Ff] [Oo] [Oo]-[Bb] [Aa] [Rr]. [Aa] 12. Next page