PHP Eighth lesson string splitting common functions
Course Outline:
This lesson allows you to perform basic operations on strings.
String Knowledge Points:
1. Introduction to Handling strings
2. Commonly used string output functions
3. Commonly used string formatting functions
4. String comparison function
5. Application of regular expressions in strings
6. Regular expressions used with Per1
1.pathinfo ();//Returns the path information for the domain name
2.parse_url ();
3.parse_str ();//used for splitting parameters
PathInfo ();
";p Rint_r ($arr); echo"
";? >
Split a domain name into an array
";p Rint_r ($arr 4); echo"
";? >
The same approach takes
";p Rint_r ($arr 4); echo"
";? >
Method 3
";p Rint_r ($arr 3); echo"
";? >
String Knowledge Points:
1. Introduction to Handling strings
2. Commonly used string output functions
3. Commonly used string formatting functions
4. String comparison function
5. Application of regular expressions in strings
6. Regular expressions used with Per1
String functions
Echo
Print
printf (); Direct output
sprintf (); direct return
Connector for string:
. Connect with points
print "AAAAAAAAAA";
printf ("----%s--$s--", $a, $b);
%s string
%d numbers
%f floating point type (%.2f = two digits after decimal point)
sprintf (); No direct output, return a new variable
Commonly used string formatting functions:
1. Remove space and string fill function
1.ltrim (); Remove left space
2.rtrim (); Remove Right space
3.trim (); Remove both spaces
4.str_pad ();//used to fill a space or a custom character for a specified length
5.str_repeat ();//For repeating the preceding characters (for creating an unlimited category menu)
6.strlen ()//Get string length
echo "|". Str_repeat ("-", 5). " BB ";
String Case Conversion function
1.strtoupper ();//convert All to uppercase
2.strtolower ();//convert All to lowercase
3.ucfirst ();//Capitalize First letter
4.ucwords (); Capitalize the first letter of each letter
Other string formatting functions:
1.strlen ();//String length
2.strrev ();//String rollover
3.number_format ();//format session numeric character function
4.MD5//MD5 Encrypted string, 32-bit string
5.str_shuffle (); Random scrambled string, number of digits unchanged
String functions:
String functions associated with HTML:
1.NL2BR (): Convert/N to BR label
2.htmlspecialchars (); Turn entity
' < > & turn into entity
": Represents the Entity
<: Less than number
: Greater than sign
3.addslashes ()//' "" \ in front add \ Reduce damage to the database
4.stripslashes ()//' "" \ Remove the front \
3.strip_tags (); Keep only certain tags, remove the labels you want to remove
Note: It is recommended that you perform three-way control before the database is inserted into the database
1.[b][/b] Convert only limited labels, do label filtering
2.addslashes ();
' "" \ \ \ \ \ \ \ \ \ \ \ \ \ "
3.htmlspecialchars ()
' < > & turn into Entities to prevent the database from being photographed in any fairly fast
http://www.bkjia.com/PHPjc/871182.html www.bkjia.com true http://www.bkjia.com/PHPjc/871182.html techarticle PHP Eighth lesson string Splitting common Functions Course Summary: This lesson enables you to perform basic operations on strings. String knowledge Points: 1. Introduction to String Processing 2. Common string Output ...
