php - Find nearest "parameter 2" that appears before "parameter 1" when searching through a file

Solution:

What you want to do is read the entire file contents in as a single string, then split it up based on what you find in it. As follows:

// Read the contents of the file into $file as a string
$mainfilename = "/path/to/file.txt";
$handle = fopen($mainfilename, "r");
$file = fread($handle, filesize($mainfilename));
fclose($handle);

/* $file contains your file contents
 * $findme contains "Found an XML file"
 * $splitter contains "Closing XML file"
 */

// We only do anything if the string "Closing XML file" is inside the file
// in a place other than at the beginning of the file
if (strpos($file, $splitter) > 0) {

    // Break up $file into pieces by splitting it along "Closing XML file"
    $parts = explode($splitter, $file);

    // Traverse the newly-formed pieces
    foreach ($parts as $part) {

        // If we have "Found an XML file" contained in this piece of the file
        if (strpos($part, $findme) !== false) {

            // Split up our smaller string around "Found an XML file"
            $foundparts = explode($findme, $part);

            // The last piece will always contain the filename,
            // but only if there are two or more pieces
            // i.e. something between the strings
            if (count($foundparts) > 1) $filename = array_pop($foundparts);
            /* Do whatever you want with $filename */ 
        }
    }
}
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What this will do is, supposing$file == "Closing XML file gibberish goes here Found an XML file garbage Found an XML file filename.xls Closing XML file more gibberish":

1. Check to make sure Closing XML file is present within$file in a place other than at the start - it is, near the end.
2. Split$file into pieces:$parts = ['', ' gibberish goes here Found an XML file garbage Found an XML file filename.xls ', ' more gibberish']
3. Traverse$parts looking for instances of "Found an XML file" -$parts[1] has it
4. Split$parts[1] into pieces:$foundparts = [' gibberish goes here',' garbage ', ' filename.xls ']
5. If there are at least 2 pieces in$foundparts, 'pop' the last element off of$foundparts, as that will always be the one that contains the filename
6. You now have the filename in$filename, to do with as you please

Note: these functions are case-sensitive, so if you also want to find instances of "Found an xml file" (with xml being lowercase), you'll need to do some string conversion to all lower-case for all of$file,$splitter, and$findme

Solution:

<?php
// Ex: OPA_4636367.xml
foreach(glob("*.txt") as $file) {
    $file_designation = explode('_', $file);
    if ($file_designation[0] == 'OPA') {
        // XML found
        // Do file_get_contents($file) or whatver
    }
}
?>
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