Summary of usage of commonly used strings in php

echo implode(",", array('lastname', 'email', 'phone'));//Convert array to string

explode:

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

split:

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

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);/ /Returns: 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 '' ;
echo strtok("nt"); //When returned for the second time: an example
echo '';
echo strtok("nt"); //When returned for the third time: string

2, search and replace of strings 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 position where the letter a appears, 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 cells matching the pattern
$food = preg_grep("/^p/",array("apple","orange","pip","banana"));
print_r ($food); //Return: Array ( [2] => pip )

strtr:

//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 For strings, replace all w's with s and all o's with x

strspn:

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

3, regular matching of strings 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 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 ("']*?>.*?'si", // Remove javascript
"'<[/!]*?[^<>]* ?>'si", // Remove HTML tags
"'([rn])[s]+'", // Remove whitespace characters
"'&(quot|#34);'i", // Replace HTML entities
"'&(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 you want to add, and it conforms to the regular expression.
echo preg_quote('$40 for a g3/400','/');//Return: $40 for a g3/400

sql_regcase:

//Generate regular expression for size-insensitive matching
echo sql_regcase("Foo-bar.a"); //Return: [Ff][Oo][Oo]-[Bb] [Aa][Rr].[Aa]

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