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❮ PHP String Reference

Example

Return “world” from the string:

echo substr(“Hello world”,6);
?>

Try it Yourself »

Definition and Usage

The substr() function returns a part of a string.

Syntax

substr(string,start,length)

Parameter Values

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
  • If the length parameter is 0, NULL, or FALSE – it return an
    empty string

Technical Details

Return Value: Returns the extracted part of a string, or FALSE on failure, or an empty string
PHP Version: 4+
Changelog: PHP 7.0 – If string = start (in characters long), it
will return an empty string. Earlier versions returns FALSE.
PHP 5.2.2 – 5.2.6
– If start has the position of a negative truncation, FALSE is returned. Other versions get the string from start.

More Examples

Example

Using the start parameter with different positive and negative numbers:

echo substr(“Hello world”,10).”
“;
echo substr(“Hello world”,1).”
“;
echo substr(“Hello world”,3).”
“;
echo substr(“Hello world”,7).”
“;






echo substr(“Hello world”,-1).”
“;
echo substr(“Hello world”,-10).”
“;
echo substr(“Hello world”,-8).”
“;
echo substr(“Hello world”,-4).”
“;
?>







Try it Yourself »

Example

Using the start and length parameters with different positive and negative numbers:

echo substr(“Hello world”,0,10).”
“;
echo substr(“Hello world”,1,8).”
“;
echo substr(“Hello world”,0,5).”
“;
echo substr(“Hello world”,6,6).”
“;






echo substr(“Hello world”,0,-1).”
“;
echo substr(“Hello world”,-10,-2).”
“;
echo substr(“Hello world”,0,-6).”
“;
?>





Try it Yourself »

❮ PHP String Reference