To insert a character into another string using PHP, you need to use the
substr_replace() function is used to replace a portion of a string.
The function accepts 4 arguments as shown below:
substr_replace( array|string $string, array|string $replace, array|int $offset, array|int|null $length = null ): string|array
To insert characters without replacing the original string, you need to pass
0 as the
$length argument of this function.
Let’s see an example. Suppose you need to insert the word
very into the string
I am feeling lucky today.
Here’s how you do it using
<?php $str = "I am feeling lucky today"; $new_str = substr_replace($str, "very ", 13, 0); print $new_str; // I am feeling very lucky today
To insert characters into a string, you need to count the index where you want to insert the string. A string index starts from the left at
very needs to be placed before the word
The index of
lucky is 13, so that’s what you need to pass as the
You also need to pass
0 as the
$length argument, because the function will remove the rest of the string if you don’t pass any
<?php $str = "I am feeling lucky today"; $new_str = substr_replace($str, "very ", 13); print $new_str; // I am feeling very
You can pass a single character or a string as the
$replace() argument to the
Make sure that you pass the right
$offset argument, or you will have a wrong string.
Now you’ve learned how to insert characters into a string at any position with PHP. Great job!