How to Extract the Substring Before the Last Occurrence of a Character in PHP?

Extracting Substrings Before the Final Character Occurrence in PHP

In PHP, determining the substring preceding the final instance of a specific character can be a common task. Consider the following example:

<code class="php">$string = "Hello World Again";
echo strrchr($string, ' '); // Outputs ' Again'</code>

This snippet successfully extracts the substring after the last space character, resulting in ' Again'. However, the requirement here is to obtain "Hello World," the substring before the final space occurrence.

Solution:

To achieve this, we can combine two useful PHP string functions:

1. strrpos(): This function locates the last occurrence of a character within a string and returns its position. In our case, we seek the index of the final space (' ').
2. substr(): With substr(), we can extract a specified portion of a string.

Combining these functions, we can extract the desired substring with the following code:

<code class="php">$string = "Hello World Again";
echo substr($string, 0, strrpos($string, ' ')); // Outputs 'Hello World'</code>

This snippet first uses strrpos() to determine the index of the last space character and then employs substr() to extract the substring from the beginning of the string up to but not including that index.

Note: If the character is not found in the string, nothing will be echoed.

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