PHP introductory tutorial operator and control structure process, combined with examples, a detailed analysis of PHP's basic assignment, auto-increment, comparison, ternary operator, as well as if statements, switch statements, for statements, etc. Flow control Tips for using statements. The code is as follows:
Demo1.php
1 2 3 4 5 6 7 8 9 10 11 | <?php
$username = "chaoyv" ;
echo "His name is $username !" ;
$username2 = "吴者然" ;
echo "His name is $username2 ! " ;
echo "<br/>" ;
echo "His name is " . $username2 . ",阅谁问君诵,\n水落清香浮。" ;
echo "<br/>" ;
echo "His name is " . $username2 . ",阅谁问君诵,\t水落清香浮。" ;
echo 'His name is $username2 ! ';
?>
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Demo2.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <?php
$a = 5;
$b = 6;
$a = $b ++;
echo $a ;
echo $b ;
?>
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Demo3.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <?php
$a = 5;
$b = 5;
$c = ( $a == $b );
$d = 8;
$e = 7;
$f = ( $d == $e );
echo $c || $f ;
?>
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Demo4.php
1 2 3 4 5 6 7 | <?php
$total = 80;
$sum = $total >50?'成功':'失败';
echo $sum ;
?>
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Demo5.php
1 2 3 4 5 6 | <?php
$a = @(100/0);
echo $a ;
?>
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Demo6.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | <?php
$userAge = 25;
if ( $userAge <18){
echo '<18';
} elseif ( $userAge <30){
echo '<25';
} else {
echo '通过';
}
?>
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Demo7.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <?php
$weekday = 3;
switch ( $weekday ){
case 1:
echo '今天星期一';
break ;
case 2:
echo '今天星期二';
break ;
case 3:
echo '今天星期三';
break ;
case 4:
echo '今天星期四';
break ;
default :
echo '不清楚';
}
?>
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Demo8.php
1 2 3 4 5 6 7 8 9 10 | <?php
$a = 10;
while ( $a > 0){
echo $a ;
$a --;
echo '<br/>';
}
?>
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Demo9.php
1 2 3 4 5 6 7 | <?php
for ( $a =10; $a >0; $a --){
echo $a ;
echo '<br/>';
}
?>
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Demo10.php
1 2 3 4 5 6 7 8 9 | <?php
$a = 10;
do {
echo $a ;
echo '<br/>';
$a --;
} while ( $a >0);
?>
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Demo11.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | <?php
for ( $i = 0; $i <10; $i ++){
if ( $i ==5){
continue ;
}
echo $i .'<br/>';
}
?>
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