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PHP substr_replace() Function

❮ PHP String Reference


Replace "Hello" with "world":

echo substr_replace("Hello","world",0);
Try it Yourself »

Definition and Usage

The substr_replace() function replaces a part of a string with another string.

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

Note: This function is binary-safe.



Parameter Values

Parameter Description
string Required. Specifies the string to check
replacement Required. Specifies the string to insert
start Required. Specifies where to start replacing in the string
  • A positive number - Start replacing at the specified position in the string
  • Negative number - Start replacing at the specified position from the end of the string
  • 0 - Start replacing at the first character in the string
length Optional. Specifies how many characters should be replaced. Default is the same length as the string.
  • A positive number - The length of string to be replaced
  • A negative number - How many characters should be left at end of string after replacing
  • 0 - Insert instead of replace

Technical Details

Return Value: Returns the replaced string. If the string is an array then the array is returned
PHP Version: 4+
Changelog: As of PHP 4.3.3, all parameters now accept arrays

More Examples


Start replacing at the 6th position in the string (replace "world" with "earth"):

echo substr_replace("Hello world","earth",6);
Try it Yourself »


Start replacing at the 5th position from the end of the string (replace "world" with "earth"):

echo substr_replace("Hello world","earth",-5);
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Insert "Hello" at the beginning of "world":

echo substr_replace("world","Hello ",0,0);
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Replace multiple strings at once. Replace "AAA" in each string with "BBB":

$replace = array("1: AAA","2: AAA","3: AAA");
echo implode("<br>",substr_replace($replace,'BBB',3,3));
Try it Yourself »

❮ PHP String Reference