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F5224
WEB PROGRAMMING
STRING IN PHP
ENVIRONMENT
Prepared by: Munirah Abd
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PHP StringIntroduction-
The string functions allow you to manipulate strings.
A string variable is used to store and manipulatetext.
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strlen() function
The strlen() function returns the length of a string.
DEFINITION & USAGE
strlen(string)
SYNTAX
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strlen() function
Parameter Descriptionstring Required. Specifies the
string to check
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strlen() function
EXAMPLE
12
OUTPUT
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strpos() function
The strpos() function finds the position of the last occurrence of a string
inside another string.
This function returns the position on success, otherwise it returns FALSE.
DEFINITION & USAGE
strpos(string,find,start)
SYNTAX
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strpos() function
Parameter Descriptionstring Required. Specifies the string to
searchfind Required. Specifies the string to
findstart Optional. Specifies where to
begin the search
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strpos() function
EXAMPLE
6
OUTPUT
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strstr() function
The strstr() function searches for the first occurrence of a string inside
another string.
This function returns the rest of the string (from the matching point), orFALSE, if the string to search for is not found.
DEFINITION & USAGE
strstr(string,search)SYNTAX
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strstr() function
Parameter Description
string Required. Specifies the string tosearch
search Required. Specifies the string tosearch for. If this parameter is a
number, it will search for thecharacter matching the ASCII
value of the number
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strstr() function
EXAMPLE 1
world!
OUTPUT
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substr() function
The substr() function returns a part of a string.
DEFINITION & USAGE
substr(string,start,length)
SYNTAX
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substr() function
Parameter Descriptionstring Required. Specifies the string to return a part ofstart Required. Specifies where to start in the stringA
positive number - Start at a specified position in
the string
A negative number - Start at a specified
position from the end of the string
0 - Start at the first character in stringlength Optional. Specifies the length of the returned
string. Default is to the end of the string.A
positive number - The length to be returned
from the start parameter
Negative number - The length to be returned
from the end of the string
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substr() function
EXAMPLE 1
world!
OUTPUT
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substr() function
EXAMPLE 2
world
OUTPUT
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THE END
