Blog : PHP substr() Function

PHP substr() Function

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 Complete PHP String Reference
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Definition and Usage
The substr() function returns a part of a string.

Syntax
substr(string,start,length)  

Parameter Description
string Required. Specifies the string to return a part of
start Required. Specifies where to start in the string
A 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 string
 
length 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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Tips and Notes
Note: If start is a negative number and length is less than or equal to start, length becomes 0.
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Example 1
echo substr("Hello world!",6);
?>  

The output of the code above will be:

world!  


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Example 2
echo substr("Hello world!",6,5);
?>  

The output of the code above will be:

world