PHP 2

Условни оператори

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

var_dump($myVar);

http://php.net/manual/en/types.comparisons.php

//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 );

Да се внимава със загубата на информация

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

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';

for

for ($i = 0; $i < 10; $i++){}

for

for ($i = 0; $i < 10; $i++){
  echo $i.'<br />';
}

echo $i.'END';

for ($i = 0; $i < 10; ++$i){
  echo $i.'<br />';
}

echo $i.'END';

$i = 0;
for (; $i < 10; $i++){
  echo $i.'<br />';
}

echo $i.'END';

$i = 0;
for (;$i < 10;){
  $even[] = $i;
  $i = $i+2;
}

echo '<pre>'; 
print_r($even);
echo '</pre>';

$i = 1; $max = 10;
for (;;){
  $odd[] = $i;
  if( $i > $max){
    break;
  }      
  $i = $i+2;
}

echo '<pre>'; 
print_r($odd);
echo '</pre>';

foreach

$even = array( 0, 2, 4, 6, 8);

foreach($myVar as $value)
{
  echo $value.'<br />';
}

$even = array( 0, 2, 4, 6, 8);

foreach($myVar as $value)
{
  if( $value == 4 ){
    continue;
  }
  echo $value.'<br />';
}

$myNames['first'] = 'Ivan';
$myNames['second'] = 'Ivanov';
$myNames['last'] = 'Todorov';

foreach($myNames as $key => $value){
  echo $key.': '.$value.'
';
}

while

Контролираме условието

$i = 0;
while( $i < 10 )
{
  echo $i.'
';
  $i++;
}