substr_replace

Definition and usage

substr_replace() function replaces part of the string with another string.

Note: If the start parameter is a negative number and length is less than or equal to start , then length is 0.

Note: This function is binary safe.

Example

Example 1

Replace "Hello" with "world":

 <?php
echo substr_replace ( "Hello" , "world" , 0 ) ;
?>

Try it yourself

Example 2

Replace from the 6th position of the string (replace "world" with "Shanghai"):

 <?php
echo substr_replace ( "Hello world" , "Shanghai" , 6 ) ;
?>

Try it yourself

Example 3

Replace from the 5th position at the end of the string (replace "world" with "Shanghai"):

 <?php
echo substr_replace ( "Hello world" , "Shanghai" , - 5 ) ;
?>

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Example 4

Insert "Hello" at the beginning of "world":

 <?php
echo substr_replace ( "world" , "Hello " , 0 , 0 ) ;
?>

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Example 5

Replace multiple strings at once. Replace "AAA" in each string with "BBB":

 <?php
$replace = array ( "1: AAA" , "2: AAA" , "3: AAA" ) ;
echo implode ( "<br>" , substr_replace ( $replace , 'BBB' , 3 , 3 ) ) ;
?>

Try it yourself

grammar

 substr_replace ( string , replacement , start , length )