Summary based on PHP commonly used strings (to be continued)_PHP tutorial

1. Split and merge
implode:
echo implode(",", array('lastname', 'email', 'phone'));//Convert array to string

explode:
print_r(explode(",", 'lastname,email,phone'));//Convert string into array

split:
print_r(split( "[/.-]","2008-9.12"));//Cut into an array with any symbol of / or . or -

str_split:
print_r(str_split("Hello Friend", 1));//Split the string

preg_split:
//Regular split
//$ops = preg_split("{[+*/-]}","3+ 5*9/2");
//print_r($ops);//Return: Array ( [0] => 3 [1] => 5 [2] => 9 [3] = > 2)

http_build_query:
//Generate the request string after url-encoded
$data = array('localhost'=>'aa',
'user' =>'bb',
'password'=>'cc');
echo http_build_query($data);//Return: localhost=aa&user=bb&password=cc

strtok:
//Cut the string into small segments
$string = "This istan examplenstring";
echo strtok($string,"nt");//Return: This is
echo '< hr>';
echo strtok("nt"); //When returning for the second time: an example
echo '

---

';
echo strtok("nt"); //When Return for the third time: string
2. Find and replace
Many of the strings are r: take the last one, i: case-insensitive
echo $pos = strpos( 'abcdef abcdaef', 'a'); // The first occurrence of the letter a, case sensitive
echo $pos = strrpos('abcdef abcdeaf', 'a'); // The last occurrence of the letter a position, 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: Then return: @mple.com,

preg_grep:
//Return the array unit matching the pattern
$food = preg_grep("/^p/",array("apple"," orange","pip","banana"));
print_r($food); //Return: Array ( [2] => pip )

strtr:
//With Replace the found string with the specified array
$arr = array("www"=>"ftp","yahoo"=>"baidu");
echo strtr("www.yahoo.com" ,$arr);//Return: 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

strspn:
//Find the length of the first part of the comparison
echo strspn("abcdefg","1234567890 ");//Return: 0
//Find the length of the initial part that is not matched
echo strcspn("abcdefg","1234567890");//Return: 7


3. Regular
preg_match:
//Returns the number of times pattern is matched. Either 0 times (no match) or 1 time, since 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, it will search until the end of the subject.
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]);//Get all phone numbers

ereg_replace:
//Replace URL with hyperlink
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",                                                                                                                                                                                                     Replace HTML entity
"'&(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(161),
chr(162),
chr(163),
chr (169),
"chr(\1)");
echo $text = preg_replace ($search, $replace, 'test<script>alert("adfasdf" );</script>');

preg_quote:
//Escape regular expression characters, add each one to conform to the regular expression.
echo preg_quote('$40 for a g3/400','/');//Return: $40 for a g3/400

sql_regcase:
//Generate size-insensitive Matching regular expression

echo sql_regcase("Foo-bar.a"); //Return: [Ff][Oo][Oo]-[Bb][Aa][Rr].[Aa]

4.URL encoding processing function
urlencode:
echo $str = urlencode('http://www.baidu.com?key=Baidu');/ /Encoding
echo urldecode($str);//Decoding

rawurlencode:
//The sequence of percent sign (%) followed by two hexadecimal numbers will be replaced with the original Meaning character
//Note: rawurldecode() will not decode the plus sign ('+') into a space, but urldecode() can.
echo $str = rawurlencode('http://www.baidu.com?key=Baidu');//Encoding
echo rawurldecode($str);

parse_url:
//Parse the URL and return its components
print_r(parse_url("http://username:password@hostname/path?arg=value#anchor"));

parse_str:
/ / is to parse the URL into variables
$str = "id=1&name=2";
parse_str($str);
echo $name;
//When there is a second parameter, put The value is stored in the array
$str = "id=1&name=2";
parse_str($str,$array);
print_r($array);

5 .Time function
mktime:
//Convert date to timestamp
echo time()-mktime(0,0,0,9,17,2008);//Return: current The time is different from September 17, 2008.
echo date('Y-m-d H:i:s');//The current date and time

getdate:
//Get date/time information
print_r(getdate(time( )));
6. Compare
similar_text:
//Compare the similarity of two strings
$a = "Hellohhh6";
$b = "hello3hh";
echo similar_text($a,$b);//Return: 6 Compare how many identical characters there are in the corresponding positions
echo "
";
similar_text($a, $b,$similar);
echo $similar."%"; //Output the percentage of identical characters

soundex:
//Compare the pronunciation of two words
$a = "ddHello6";
$b = "hello3";
echo soundex($a)."
";
echo soundex($b)."
";
if(soundex($a)==soundex($b)) echo "same pronunciation";else echo 'different';

strnatcmp():
//Character processing according to natural sorting method String comparison
$arr = array("a1.jpg","a2.jpg","a3.jpg","a4.jpg");
$max = $arr[0];
for($i=0;$i{
if(strnatcmp($arr[$i],$max)>0)
$max = $arr[$i];
}
echo $max;//Return: a4.jpg

strcmp:
//Case-sensitive, string comparison by bytes, When the first string is greater than the second string, return: 1, equal to return: 0, less than return: -1
echo strcmp('abc','Abc');
strcasecmp:
/ /Return the difference between two strings
echo strcasecmp('wbc','bbc'); //Return: 21
strncmp:
//Specify the number of characters for string comparison, this The function is similar to , except that you can specify the number of characters in the string to be compared. If any string is shorter than len, the length of that string will be used for comparison
echo strncmp("adrdvark","aardwolf",4); //Return: 1

7. Sort
sort:
//Rearrange the values ​​of the array from a-z
$a = array("1","s","3","n" ,"5");//Return: 1,3,5,n,s
sort($a);//Sort print_r($a);


8 .Other
str_pad:
//Padding the string to the specified length, pad_type can be STR_PAD_RIGHT, STR_PAD_LEFT or STR_PAD_BOTH
echo str_pad("www.yahoo.com",17,"_ ",STR_PAD_BOTH);//String filling function__www.yahoo.com__
strlen("aaa");//Finding the length of the array returns: 3
strrev();//Reversal of string
strtolower();//Convert to lowercase
strtoupper();//Convert to uppercase
str_replace() replaces the string, case-sensitive str_ireplace() not case-sensitive
ucfirst( );//Convert the first letter to uppercase
ucwords();//Convert the first letter of each word to uppercase
echo join("&",array('wo', ' men', 'shi'));//The concatenation of strings returns: wo&men&shi is concatenated with &

count_chars:
//Returns the information of the characters used in the string
print_r(count_chars("Hellohhh6",0));//Returns the number of times each byte value (0~255) appears in the string as an array of values. 0 lists all. 1Only list the occurrences greater than 0. 2 only lists those whose occurrence count is equal to 0. 3Returns a string consisting of the byte values ​​used. Such as: 6Hehlo.4Return a string composed of unused byte values
str_replace:
str_replace("yahoo","baidu","www.yahoo.com");
$c = "www.yahoo" .com";
$arr = array("yahoo","com");
echo str_replace($arr,"baidu",$c);//Return: www.baidu.baidu

$c = "www.yahoo.com";
$arr1 = array("www","yahoo","com");
$arr2 = array("ftp","baidu" ,"net");
echo str_replace($arr1,$arr2,$c);//Return: ftp.baidu.net

substr($a,2,2);//Get Substring
echo substr_count("This is a test", "is");//Count the number of occurrences of substring
substr_replace();//Replace substring

$url = "http://localhost/zheng_ze_biao_da/youxiang.php";
echo substr($url,strrpos($url,"/")+1);//Return: youxiang.php is used to return File name

str_word_count:
$a = "I/ love/ you/";
echo str_word_count($a);//Return: 3 Count the number of words in the string
print_r(str_word_count($a,1));//Return: Array ( [0] => I [1] => love [2] => you )
//print_r(str_word_count($ a,2));//Return: Array ( [0] => I [3] => love [9] => you )
//print_r(str_word_count($a,1,"/ "));Return: Array ( [0] => I/ [1] => love/ [2] => you/ ) Here the "/" is ignored

http://www.bkjia.com/PHPjc/327511.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/327511.htmlTechArticle1. Split and merge implode: echo implode(",", array('lastname', 'email', 'phone'));//Convert array to stringexplode: print_r(explode(",", 'lastname,email,phone'));//Convert string to array...