How to Replace the Last Occurrence of a String in PHP?

Finding the Last String Occurrence with Precision

Replacing a specific occurrence of a string within a larger string can be a common programming task. However, finding the last occurrence can prove challenging without an efficient method.

Last Occurrence Replacement Solution

To address this, consider utilizing the str_lreplace() function, designed to replace the last occurrence of a specified string with a new string. Unlike other string replacement functions, this function pinpoints the last occurrence, even if it's not at the end of the string.

To illustrate its functionality:

<code class="php">function str_lreplace($search, $replace, $subject)
{
    $pos = strrpos($subject, $search);

    if($pos !== false)
    {
        $subject = substr_replace($subject, $replace, $pos, strlen($search));
    }

    return $subject;
}</code>

In this function, strrpos() locates the position of the last occurrence of the $search string in $subject. If found, substr_replace() modifies the subject string, replacing the $search occurrence with the $replace string.

Example Usage

Consider the following example:

<code class="php">$search = 'The';
$replace = 'A';
$subject = 'The Quick Brown Fox Jumps Over The Lazy Dog';</code>

Running str_lreplace($search, $replace, $subject) will produce:

The Quick Brown Fox Jumps Over A Lazy Dog

This demonstrates the function's ability to precisely replace the last occurrence of "The" in the subject string.

Implementing the str_lreplace() function in your codebase provides a straightforward and reliable method for performing last-occurrence string replacements, ensuring accuracy and efficiency in your string manipulation tasks.

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