Prepared By : Uday Shah (HOD-IT)
Contact No : 7600044051
E-Mail : rupareleducation@gmail.com
PHP String Function
No
|
Name
|
Description
|
1
|
chr()
|
This function returns a one
character string containing character specified by ascii.
syntax: string chr(ASCII)
Ex: echo chr(65);
|
2
|
ord()
|
This function returns the
ascii value of the characters of string.
syntax: int ord(string)
Ex: echo ord(“A”);
|
3
|
strtolower()
|
It returns string with all
alphabetic characters converted into lower case.
syntax: string
strtolower(string)
Ex: echo
strtolower(“WELCOME”);
|
4
|
strtoupper()
|
It returns string with all
alphabetic characters converted to uppercase.
syntax: string
strtoupper(string)
Ex: echo
strtoupper(“welcome”);
|
5
|
Strlen()
|
It returns the length of
the given string.
syntax: int strlen(string)
Ex:echo strlen(“welcome”);
|
6
|
Ltrim()
|
It squeeze the white space
from the beginning of the string.
syntax: string ltrim(string)
ex: ltrim(“ welcome”);
|
7
|
Rtrim()
|
It squeeze the white space
from the ending of a string.
syntax: string
rtrim(string)
Ex: echo
rtrim(“welcome “);
|
8
|
trim()
|
Trim is same as ltrim and
rtrim function but it squeeze space from both left side and right side.
syntax: string trim(string)
Ex:echo trim(“ welcome “);
|
9
|
substr()
|
It returns the part of a
string.
Syntax: substr(string, int
start[,int length])
Substr returns the part of
a string specified by the start & length parameters.
Ex: echo
substr(“abcde”,0,2);
For instance in the string
“abcde” the character or position 0(zero) is “a” character at the position 2
is “c” character and so on.
|
10
|
strcmp()
|
It compares two string if
it returns <0 if str 1 is less than str 2; >0 if str 1 is greater than
str2, and 0 if they are equal.
It is Binary safe string
comparison.
This comparison is case
sensitive.
Syntax: int
strcmp(string1,string2)
Ex: echo
strcmp(“Hello”,”hello”);
|
11
|
strcasecmp()
|
It is case insensitive
string comparison.
Syntax:
Int
strcasecmp(string1,string2)
Ex: $var1=”Hello”;
$var2=”hello”;
echo
strcasecmp($var1,$var2);
|
12
|
strpos()
|
It is used to find position
of first occurrence of a string.
It returns the numeric
position of the first occurrence in
the string. If string not found it will return false.
Syntax: int strpos(string1,
position)
Ex: <?php
$newstring=”abcdef abcdef”;
$pos=strpos($newstring,’a’);
echo $pos;
?>
|
13
|
strrpos()
|
It is used to find position
of last occurrence of a character in a string.
It returns the numeric
position of the last occurrence in the string. If not found , it returns
false.
Syntax: int
strrpos(string1, chr);
Ex: <?php
$newstring=”abcdef abcdef”;
$pos=strrpos($newstring,’a’);
echo $pos;
?>
|
14
|
Strstr()
|
It returns a part of a
string from the first occurrence to the end of string.
This function is case
sensitive.
Syntax:
strstr(string,parameter)
Ex: <?php $email=User@example.com;
$domain=strstr($email,’@’); echo $domain;
?>
|
15
|
stristr()
|
It returns all of the
string from the first occurrence to the end.
It is case insensitive,
means here you can use capital letters or small letters but the answer will
be same.
Syntax:
stristr(string,parameter);
Ex: <?php $email=User@example.com;
$domain=stristr($email,’E’);
echo $domain;
?>
|
16
|
str_replace()
|
It is used to replace all
occurrence of the search string with the replacement string.
This function returns a
string or an array with all occurrence of search in subject replaced with the
given value.
In this function every
parameter can be an array.
Syntax:str_replace(search
string,replace string,count)
<?php
$vowels=array(“a”,”e”,”i”,”o”,”u”,”A”,”E”,”I”,”O”,”U”);
$x=str_replace($vowels,”*”,”Hello
World of PHP”);
echo $x;
?>
|
17
|
strrev()
|
It is used to reverse a
string.
Syntax: string
strrev(string);
Ex:strrev(“Welcome”);
|
18
|
echo()
|
It is used to print the out
put for one or more string.
Echo is not actually a
function, so you are not require to use parameters with it.
Syntax:echo (string argu1);
Ex: echo “Hello world”;
|
19
|
print()
|
It is used to get output of
a string. Print is not actually a real function.
So you are not require to
use parenthesis with it.
It is also used to print a
statement in multiple lines.
Syntax: print(string arg);
Ex: print “this spans
Multiple lines The new
Lines will be output as well.”;
|
20
|
Explode()
|
The explode()
function breaks a string into an array.
Note: The
"separator" parameter cannot be an empty string.
Syntax
explode(separator,string,limit)
<?php
$str = "Hello world. It's a beautiful day."; print_r (explode(" ",$str)); ?> |
21
|
implode()
|
The
implode() function returns a string from the elements of an array. Note: The implode() function accept its parameters in either order. However, for consistency with explode(), you should use the documented order of arguments.
Syntax
implode(separator,array)
Example
<?php
$arr = array('Hello','World!','Beautiful','Day!'); echo implode(" ",$arr); ?> |
22
|
join()
|
The join() function returns a string from the
elements of an array.
The join() function is an alias of the implode() function.
Syntax
join(separator,
array)
Example
<?php$arr=array('Hello','World!','Beautiful','Day!'); echo join(" ",$arr); ?> |
23
|
md5()
|
The
md5() function calculates the MD5 hash of a string. The md5() function uses the Data Security, Inc. MD5 Message-Digest Algorithm.
Syntax
md5(string,raw)
Example
<?php
$str = "Hello"; echo md5($str); ?> |
24
|
Str_split
()
|
The
str_split () function splits a string into an array.
Syntax
str_split(string,length)
Example
<?phpprint_r(str_split("Hello")); ?> |
25
|
Str_shuffle
()
|
The
str_shuffle() function randomly shuffles all the characters of a string.
Syntax
str_shuffle(string)
<?php
$str=’abcdef’;
$shuffled=str_shuffle($str);
Echo $shuffled;
?> |
26
|
Strcspn
()
|
The
strcspn() function returns the number of characters (including white spaces)
found in a string before any part of the specified characters are found.
Syntax
strcspn(string,char,start,length)
Example
Print
the number of characters found in "Hello world!" before the
character "w":<?php echo strcspn("Hello world!","w"); ?> |
27
|
strpbrk()
|
The
strpbrk() function searches a string for any of the specified characters. Note: This function is case-sensitive. This function returns the rest of the string from where it found the first occurrence of a specified character, otherwise it returns FALSE.
Syntax
strpbrk(string,charlist)
Example
<?phpecho strpbrk("Hello world!","oe"); ?> |
28
|
substr_compare()
|
The
substr_compare () function compares two strings from a specified start
position.
Syntax
substr_compare
(string1, string2, startpos, length,case)
Compare
two strings, when start position in string1 for the comparison is 6th:<?php echo substr_compare("Hello world", "world",6); ?> |
29
|
substr_count
()
|
The
substr_count() function counts the number of times a substring occurs in a
string. Note: The substring is case-sensitive.
Syntax
substr_count(string,substring,start,length)
Count
the number of times "world" occurs in the string:<?php echo substr_count("Hello world. The world is nice","world"); ?> |
30
|
ucfirst()
|
The
ucfirst() function converts the first character of a string to uppercase. Related functions:
Syntax
ucfirst(string)
Example
Convert
the first character of "hello" to uppercase:<?php echo ucfirst("hello world!"); ?> |
31
|
ucwords()
|
Convert
the first character of each word to uppercase: Syntax: ucwords(string) <?php echo ucwords("hello world"); ?> |
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