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PHP substr() Function with Example

PHP substr() Function: Here, we are going to learn about the substr() function with example in PHP.
Submitted by IncludeHelp, on February 06, 2019

PHP substr() Function

substr() function is a string function in PHP, it is used to get the substring from specified index from the string.

Syntax:

    substr(string, start, [length]);

Here,

  • string is the main string.
  • start is the starting index of the string, from where a substring returns.
  • length is an optional parameter, it defines the number of characters to return.

Note: Negative values points to the end of string. For example: -1 points last character, -2 points second last character, -3 points third last character and so on...

Examples:

    Input:
    str = "Hello friends how are your friends?";
    start =10
    Output:
    "nds how are your friends?"

    str = "Hello friends how are your friends?";
    start =10
    length = 5
    Output:
    "nds h"

PHP code:

<?php
	$str = "Hello friends how are your friends?";
	
	//returns substring from 10th index to end of the string
	$substring = substr($str,10);
	echo ($substring . "\n");

	//returns substring from 10th index to next 5 chars
	$substring = substr($str,10,5);
	echo ($substring . "\n");	

	//testing with negative values
	$substring = substr($str,-1);
	echo ($substring . "\n");	

	//testing with negative values
	$substring = substr($str,10,-1);
	echo ($substring . "\n");

	//testing with negative values
	$substring = substr($str,-5);
	echo ($substring . "\n");	

	//testing with negative values
	$substring = substr($str,3,-5);
	echo ($substring . "\n");	
?>

Output

nds how are your friends?
nds h
?
nds how are your friends
ends?
lo friends how are your fri




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