Initial data commit

Task/Sorting-algorithms-Sleep-sort/PHP/sorting-algorithms-sleep-sort.php

@@ -0,0 +1,23 @@
+<?php
+
+$buffer = 1;
+$pids = [];
+
+for ($i = 1; $i < $argc; $i++) {
+    $pid = pcntl_fork();
+    if ($pid < 0) {
+        die("failed to start child process");
+    }
+
+    if ($pid === 0) {
+        sleep($argv[$i] + $buffer);
+        echo $argv[$i] . "\n";
+        exit();
+    }
+
+    $pids[] = $pid;
+}
+
+foreach ($pids as $pid) {
+    pcntl_waitpid($pid, $status);
+}