How can I extract a substring after a specific character in a string?

Extracting Substrings after a Specific Character

Encountering strings with a consistent structure that includes a set of numbers followed by an underscore character, the question arises: how can we retrieve the substring following this specific character?

To achieve this, we can utilize the strpos() and substr() functions. strpos() identifies the index of the underscore character, and substr() extracts the substring starting from one index after the found location until the end of the string.

Here's an example:

$data = "123_String";
$whatIWant = substr($data, strpos($data, "_") + 1);
echo $whatIWant; // Output: String

In this case, strpos() finds the underscore's index, which is 3, and substr() grabs the characters from index 4 (one after the underscore) onwards.

To ensure the string contains the underscore character before performing the extraction, you can use an if statement:

if (($pos = strpos($data, "_")) !== FALSE) {
    $whatIWant = substr($data, $pos+1);
}

This conditional check prevents errors if the string lacks the underscore.

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