PHP 2

Условни оператори

$myVar = 1;
$myZero = 0;
$myString = 'ilian';
$myZeroString = ;

type casting

Да се внимава със загубата на информация

$myVar = 1.1;
$myVar = (int) $myVar;
$myVar = (string) $myVar;
$myVar = (bool) $myVar;

var_dump($myVar);

//var_dump(  $myZero = $myVar );
//var_dump(  $myVar = $myZero );
//var_dump(  $myZero = $myString );

//var_dump(  $myZero == $myVar );
//var_dump(  $myZero == $myString ); 
//var_dump(  $my == $myZeroString ); 

//var_dump(  $myVar === $myString ); 
//var_dump(  $myVar === $myZeroString ); 
//var_dump(  $myVar == $myString );
//var_dump(  $myZeroString == $myVar );
//var_dump(  $myZeroString == $myZero );
//var_dump(  $myZeroString == $myString );

//var_dump(  $myZeroString === $myString );
//var_dump(  $myZeroString === $myVar );
//var_dump(  $myZeroString === $myZero );
//var_dump(  $myString === $myZero );

<thead> </thead> <tbody class="tbody"> </tbody>

Comparisons of $x with PHP functions

Expression	<a href="function.gettype.php" class="function">gettype()</a>	<a href="function.empty.php" class="function">empty()</a>	<a href="function.is-null.php" class="function">is_null()</a>	<a href="function.isset.php" class="function">isset()</a>	<a href="language.types.boolean.php" class="type boolean">boolean</a> : if($x)
$x = "";	<a href="language.types.string.php" class="type string">string</a>	TRUE	FALSE	TRUE	FALSE
$x = null;	<a href="language.types.null.php" class="type NULL">NULL</a>	TRUE	TRUE	FALSE	FALSE
var $x;	<a href="language.types.null.php" class="type NULL">NULL</a>	TRUE	TRUE	FALSE	FALSE
$x is undefined	<a href="language.types.null.php" class="type NULL">NULL</a>	TRUE	TRUE	FALSE	FALSE
$x = array();	<a href="language.types.array.php" class="type array">array</a>	TRUE	FALSE	TRUE	FALSE
$x = false;	<a href="language.types.boolean.php" class="type boolean">boolean</a>	TRUE	FALSE	TRUE	FALSE
$x = true;	<a href="language.types.boolean.php" class="type boolean">boolean</a>	FALSE	FALSE	TRUE	TRUE
$x = 1;	<a href="language.types.integer.php" class="type integer">integer</a>	FALSE	FALSE	TRUE	TRUE
$x = 42;	<a href="language.types.integer.php" class="type integer">integer</a>	FALSE	FALSE	TRUE	TRUE
$x = 0;	<a href="language.types.integer.php" class="type integer">integer</a>	TRUE	FALSE	TRUE	FALSE
$x = -1;	<a href="language.types.integer.php" class="type integer">integer</a>	FALSE	FALSE	TRUE	TRUE
$x = "1";	<a href="language.types.string.php" class="type string">string</a>	FALSE	FALSE	TRUE	TRUE
$x = "0";	<a href="language.types.string.php" class="type string">string</a>	TRUE	FALSE	TRUE	FALSE
$x = "-1";	<a href="language.types.string.php" class="type string">string</a>	FALSE	FALSE	TRUE	TRUE
$x = "php";	<a href="language.types.string.php" class="type string">string</a>	FALSE	FALSE	TRUE	TRUE
$x = "true";	<a href="language.types.string.php" class="type string">string</a>	FALSE	FALSE	TRUE	TRUE
$x = "false";	<a href="language.types.string.php" class="type string">string</a>	FALSE	FALSE	TRUE	TRUE

if

if

$myVar = 'Ivan';

if($myVar == 'logged'){
  echo 'You are logged';
}

echo 'Click Next';

if else

$myVar = 'Ivan';

if($myVar == 'logged'){
  echo 'You are logged';
}
else {
  echo 'Please login';
}

echo 'Click Next';

if elseif else

if($myVar == 'logged'){
  $text = 'You are logged';
}
elseif($myVar == 'guest') {
  $text = 'Please choose name';
}
else
  $text = 'Please register

echo $text.' Click Next';

() ? :

$text = ($myVar == 'logged') ? 'You are logged' : 'Please login';
echo $text.' Click Next';