How to Insert a String at a Specific Position in PHP?

Inserting a String at a Specified Position

Often when working with strings, we need to insert a string at a specific position within another string. PHP provides a convenient function for this task: substr_replace().

Using substr_replace() to Insert a String

To insert a string at a specified position, use the following syntax:

<code class="php">$newstr = substr_replace($oldstr, $str_to_insert, $pos, 0);</code>

• $oldstr: The original string.
• $str_to_insert: The string to insert.
• $pos: The position at which to insert the string.
• 0: Specifies that no characters are to be replaced.

Understanding the Offset Argument

The $pos argument represents the offset within the original string where the insertion will occur. It can be either positive or negative:

• If $pos is positive, the insertion will begin at the indicated offset.
• If $pos is negative, the insertion will begin from the end of the string, counting backwards.

For example, the following code inserts the string "test" at position 5 within the original string:

<code class="php">$oldstr = "Hello World!";
$newstr = substr_replace($oldstr, "test", 5, 0);</code>

Result:

Hello test World!

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