Replace "Hello" with "world":
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.
|string||Required. Specifies the string to check|
|replacement||Required. Specifies the string to insert|
|start||Required. Specifies where to start replacing in the string
|length||Optional. Specifies how many characters should be replaced.
Default is the same length as the string.
|Return Value:||Returns the replaced string. If the string is an array then the array is returned|
|Changelog:||As of PHP 4.3.3, all parameters now accept arrays|
Start replacing at the 6th position in the string (replace "world" with "earth"):
Start replacing at the 5th position from the end of the string (replace "world" with "earth"):
Insert "Hello" at the beginning of "world":
Replace multiple strings at once. Replace "AAA" in each string with "BBB":