Initial data commit

Task/Find-common-directory-path/PHP/find-common-directory-path-1.php

@@ -0,0 +1,57 @@
+<?php
+
+/*
+ This works with dirs and files in any number of combinations.
+*/
+
+function _commonPath($dirList)
+{
+	$arr = array();
+	foreach($dirList as $i => $path)
+	{
+		$dirList[$i]	= explode('/', $path);
+		unset($dirList[$i][0]);
+		
+		$arr[$i] = count($dirList[$i]);
+	}
+	
+	$min = min($arr);
+	
+	for($i = 0; $i < count($dirList); $i++)
+	{
+		while(count($dirList[$i]) > $min)
+		{
+			array_pop($dirList[$i]);
+		}
+		
+		$dirList[$i] = '/' . implode('/' , $dirList[$i]);
+	}
+	
+	$dirList = array_unique($dirList);
+	while(count($dirList) !== 1)
+	{
+		$dirList = array_map('dirname', $dirList);
+		$dirList = array_unique($dirList);
+	}
+	reset($dirList);
+	
+	return current($dirList);
+}
+
+ /* TEST */
+
+$dirs = array(
+ '/home/user1/tmp/coverage/test',
+ '/home/user1/tmp/covert/operator',
+ '/home/user1/tmp/coven/members',
+);
+
+
+if('/home/user1/tmp' !== common_path($dirs))
+{
+  echo 'test fail';
+} else {
+  echo 'test success';
+}
+
+?>

Task/Find-common-directory-path/PHP/find-common-directory-path-2.php

@@ -0,0 +1,22 @@
+<?php
+
+/* A more compact string-only version, which I assume would be much faster */
+/* If you want the trailing /, return $common; */
+
+function getCommonPath($paths) {
+	$lastOffset = 1;
+	$common = '/';
+	while (($index = strpos($paths[0], '/', $lastOffset)) !== FALSE) {
+		$dirLen = $index - $lastOffset + 1;	// include /
+		$dir = substr($paths[0], $lastOffset, $dirLen);
+		foreach ($paths as $path) {
+			if (substr($path, $lastOffset, $dirLen) != $dir)
+				return $common;
+		}
+		$common .= $dir;
+		$lastOffset = $index + 1;
+	}
+	return substr($common, 0, -1);
+}
+
+?>