PHP Common String Operation function Example summary trim, NL2BR, addcslashes, UUDecode, MD5, etc.

This article summarizes PHP's commonly used string manipulation functions. Share to everyone for your reference, as follows:

/* Common string output function * * the echo () output String * print () outputs one or more strings * die () outputs a message and exits the current script * printf () output formatted string * sprintf () writes the formatted string to a variable **// /ucfirst//Converts the first letter in a string to uppercase $str= "string"; Echo Ucfirst ($STR); echo "[Object Object]";//ucwords ()//capitalize the first letter of each word in the string ucword= "Hello everyone!"; echo Ucwords ($ucword); echo "[Object Object]";//ltrim () RTrim () trim ()//Remove Space $str= "123 This is a test ..."; Echo LTrim ($ STR, "0..9"). ""; Remove the digital echo rtrim ($str, ".") to the left. ""; Echo Trim ($str, "0..9A.. Z. ")." "; Remove the uppercase letters at both ends of the string, and the numbers.//html related string formatting functions//nl2br ()//convert \ n in string to "" $str = "This is \ n Hello world"; Echo nl2br ($STR). /htmlspecialchars ()//The HTML tag is displayed as a character, not interpreted $str= ""; Echo $str. ""; echo Htmlspecialchars ($STR); echo "[Object Object]";//addcslashes//add A backslash $str=addcslashes ("foo[]", "A". Z "); Echo $str." "; Echo addcslashes ("zoo[") ", ' A". Z '). ""; /convert_uuencode ()//Use UUDecode method to encode the string $string= "Hello world"; $str = Convert_uuencode ($string); Echo $str. ""; echo Convert_uudecode ($STR). ""; /html_entity_decode (string $string [, int $flags = Ent_compat | Ent_hTML401 [, String $encoding = ' UTF-8 ']]//In contrast to the Htmlentities method, converts the encoded HTML character to the form that the browser can compile $a= "I want a bright"; $b = Htmlentit IES ($a). ""; echo $b; Echo Html_entity_decode ($b); echo "[Object Object]";//htmlspecialchars_decode (string $string [, int $flags = Ent_ COMPAT | ENT_HTML401]//In contrast to the Htmlspecialchars function, convert the HTML entity to a character $c=htmlspecialchars ($a); Echo $c. ""; echo Htmlspecialchars_decode ($c). ""; echo "[Object Object]";//lcfirst (string $str)//The first character of the string is lowercase $str= "Hello world";//Echo Lcfirst ($STR). ""; /md5_file (String $filename [, bool $raw _output = false])//The file is MD5 encrypted//$string = "password"; $str =md5 ($string); if ($str = = "5f4dcc3b5aa765d61d8327deb882cf99") {echo "The password is Right";} Parse_str (String $str [, Array & $arr])//parse a string into variable and array form $str = "first=value&arr[]=foo+bar&arr[]= Baz ";p arse_str ($str, $input);p Rint_r ($input); echo" [Object Object] ";//string sha1_file (String $filename [, bool $raw _ Output = false])//Calculate hash value of file foreach (Glob ("c:/lamp/appache2/htdocs/*.php") as $ent) { if (Is_dir ($ent)) {continue;} echo $ent. " (SHA1: ". Sha1_file ($ent).") "; echo "[Object Object]";//int similar_text (String $first, String $second [, float & $percent])//calculates the similarity of two strings, by means of a reference Pass the third parameter, Similar_text () calculates the percentage of similarity to//. $string 1= "Rogerzhalili", $string 2= "Zhangjieroger", if (Similar_text ($string 1, $string 2, $percent)) {echo $string 1. " and ". $string 2." Has the similarity of: ". $percent." ";} echo "[Object Object]";//string str_shuffle (String $str)//Disturb a string $string= "I want you to solve this problem"; Echo str_sh Uffle ($string). "";  /array str_split (String $string [, int $split _length = 1])//Split the string by the specified length $arr=str_split ($string, 3);//str_word_count (String $string [, int $format = 0 [, string $charlist]]//Count the number of words in the string echo "[Object Object]";//int strripos (String $ haystack, string $needle [, int $offset = 0])//finds the last bit of the specified string in the target string//In a case-insensitive manner. Unlike Strrpos (), Strripos () is case insensitive. Offset is used to specify from that location to find $haystack= ' ababcd '; $needle = ' Ab '; echo "the Last". $needle. " Postion is: ". Strripos ($hayStack, $needle). ""; Echo Strrpos ($haystack, ' ab '); echo "[Object Object]";//string strstr (String $haystack, mixed $needle [, BOOL $before _nee Dle = false])//Returns the Haystack string starting from the first occurrence of the needle to the haystack knot//tail string. The function is case-sensitive. If you want to be case-insensitive, use//STRISTR (). $a = "the first test"; $needle = "Fi"; Echo strstr ($a, $needle). ""; if ($c =strstr ($a, "Fio") {echo "find". $c. "";} else{echo "Not find the string!";} echo "[Object Object]";//int substr_count (String $haystack, string $needle [, int $offset = 0 [, int $length]])//Find $n The number of occurrences of the eedle substring in $haystack, $needle case-sensitive $hay= "La La wa la wa wa lala"; Echo Substr_count ($hay, "la"). ""; /int Preg_match_all (String $pattern, String $subject [, Array & $matches [, int $flags = Preg_pattern_order [, int $ offset = 0]])//Regular match, the result of the match is stored to $matches (if $matches is specified) Preg_match_all ("/?" ( \D3)?? (? (1) [\-\s]) \d{3}-\d{4}/x "," Call 555-1212 or 1-800-555-1212 ", $phones); echo" "; echo" [Object Object];//preg_replace (mi Xed $pattern, mixed $replacement, mixed $subject [, int $liMIT =-1 [, int & $count]]//Search for the part of subject that matches the pattern and replace it with replacement. $string = ' April, 2003 '; $pattern = '/(\w+) ( \d+), (\d+)/I '; $replacement = ' ${1}1,$3 '; Echo preg_replace ($pattern, $replacement, $string); echo "[Object object];// Array Preg_split (String $pattern, string $subject [, int $limit = 1 [, int $flags = 0])//The given string is separated by a regular expression. $str = ' s Tring '; $chars = Preg_split ('//', $STR,-1, Preg_split_no_empty);p Rint_r ($chars);

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