fix error "A non well formed numeric value encountered in ... sfValidatorSchema"

Author: zobzn

lib/validator/sfValidatorSchema.class.php

@@ -390,18 +390,27 @@ public function __clone()
 
   protected function getBytes($value)
   {
-    $value = trim($value);
-    switch (strtolower($value[strlen($value) - 1]))
-    {
-      // The 'G' modifier is available since PHP 5.1.0
-      case 'g':
-        $value *= 1024;
-      case 'm':
-        $value *= 1024;
-      case 'k':
-        $value *= 1024;
+    preg_match('/^\s*([0-9.]+(?:E\+\d+)?)\s*([KMGTPEZY]?)B?\s*$/i', $value, $matches);
+
+    $number   = (float) $matches[1];
+    $modifier = strtoupper($matches[2]);
+
+    $exp_by_modifier = [
+      'K' => 1,
+      'M' => 2,
+      'G' => 3,
+      'T' => 4,
+      'P' => 5,
+      'E' => 6,
+      'Z' => 7,
+      'Y' => 8,
+    ];
+
+    if (array_key_exists($modifier, $exp_by_modifier)) {
+      $exp    = $exp_by_modifier[$modifier];
+      $number = $number * pow(1024, $exp);
     }
 
-    return $value;
+    return $number;
   }
 }