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更新：

PHPの型チェックのメモ

テストコード

$f = tempnam(‘/tmp/’,‘test’); $testme = array( null, true, false, array(), 0, 1, 0.10, 1.123, ‘’, ‘0’, ‘1’, ‘10’, ‘0.10’, ‘1.123’, ‘1,234,567’, ’ 1’, ’1 ’, ’ 1 ’, ‘Hello’, new stdClass(), fopen($f,‘w’), ); $result = array(); foreach($testme as $value){ $tmp = array(); $tmp[‘value’] = $value; $tmp[‘isset’] = isset($value); $tmp[‘null’] = is_null($value); $tmp[‘empty’] = empty($value); $tmp[‘bool’] = is_bool($value); $tmp[‘array’] = is_array($value); $tmp[‘string’] = is_string($value); $tmp[‘int’] = is_int($value); $tmp[‘float’] = is_float($value); $tmp[‘numeric’] = is_numeric($value); $tmp[‘scalar’] = is_scalar($value); $tmp[‘object’] = is_object($value); $tmp[‘resource’] = is_resource($value); $tmp[‘true’] = ($value) ? true : false; $tmp[‘false’] = (!$value) ? true : false; $result[] = $tmp; } fclose($value); @unlink($f); var_dump($result);

結果

array (size=21)
  0 => 
    array (size=15)
      'value' => null
      'isset' => boolean false
      'null' => boolean true
      'empty' => boolean true
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean false
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean false
      'false' => boolean true
  1 => 
    array (size=15)
      'value' => boolean true
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean true
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  2 => 
    array (size=15)
      'value' => boolean false
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean true
      'bool' => boolean true
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean false
      'false' => boolean true
  3 => 
    array (size=15)
      'value' => 
        array (size=0)
          empty
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean true
      'bool' => boolean false
      'array' => boolean true
      'string' => boolean false
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean false
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean false
      'false' => boolean true
  4 => 
    array (size=15)
      'value' => int 0
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean true
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean true
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean false
      'false' => boolean true
  5 => 
    array (size=15)
      'value' => int 1
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean true
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  6 => 
    array (size=15)
      'value' => float 0.1
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean true
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  7 => 
    array (size=15)
      'value' => float 1.123
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean true
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  8 => 
    array (size=15)
      'value' => string '' (length=0)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean true
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean false
      'false' => boolean true
  9 => 
    array (size=15)
      'value' => string '0' (length=1)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean true
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean false
      'false' => boolean true
  10 => 
    array (size=15)
      'value' => string '1' (length=1)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  11 => 
    array (size=15)
      'value' => string '10' (length=2)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  12 => 
    array (size=15)
      'value' => string '0.10' (length=4)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  13 => 
    array (size=15)
      'value' => string '1.123' (length=5)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  14 => 
    array (size=15)
      'value' => string '1,234,567' (length=9)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  15 => 
    array (size=15)
      'value' => string ' 1' (length=2)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean true
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  16 => 
    array (size=15)
      'value' => string '1 ' (length=2)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  17 => 
    array (size=15)
      'value' => string ' 1 ' (length=3)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  18 => 
    array (size=15)
      'value' => string 'Hello' (length=5)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean true
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean true
      'object' => boolean false
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  19 => 
    array (size=15)
      'value' => 
        object(stdClass)[7]
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean false
      'object' => boolean true
      'resource' => boolean false
      'true' => boolean true
      'false' => boolean false
  20 => 
    array (size=15)
      'value' => resource(10, Unknown)
      'isset' => boolean true
      'null' => boolean false
      'empty' => boolean false
      'bool' => boolean false
      'array' => boolean false
      'string' => boolean false
      'int' => boolean false
      'float' => boolean false
      'numeric' => boolean false
      'scalar' => boolean false
      'object' => boolean false
      'resource' => boolean true
      'true' => boolean true
      'false' => boolean false

@ Mac PHP 5.3.27

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