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What are some common methods in PHP to extract specific substrings from a file based on predefined keywords?

To extract specific substrings from a file based on predefined keywords in PHP, you can use functions like strpos() to find the position of the keyword in the file and then extract the substring using substr(). You can also use regular expressions with functions like preg_match() to match the keyword pattern and extract the substring accordingly.

php 
// Open the file
$file = fopen("example.txt", "r");

// Read the file contents
$content = fread($file, filesize("example.txt"));

// Define the keyword
$keyword = "specific_keyword";

// Find the position of the keyword
$pos = strpos($content, $keyword);

// Extract the substring based on the keyword
if ($pos !== false) {
    $substring = substr($content, $pos, strlen($keyword));
    echo $substring;
} else {
    echo "Keyword not found";
}

// Close the file
fclose($file);

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