/***************************by
garcon1986********************************/
<?php
//if 语句
$a = $b = 3;
if($a = $b)
print "a is equal to b<br>";
//else 语句
if($a < $b){
print "a is smaller than b";
} else {
print "a is not smaller than b<br>";
}
//elseif = else if 语句
if($a>$b){
print "a is bigger than b";
}else if($a = $b){
print "a is equal than b";
}else {
print "a is smaller to b<br>";
}
// when you don't use "{}", you can't separate elseif.
//当不用{}时，elseif不能分开
if($a>$b):
print "a>b";
elseif($a==$b):
//else if($a==$b): // this is wrong
print "a=b";
print '<br>';
endif;
//while语句
$i = 0;
while($i<=10){
print $i++.'<br>';
}
$i=15;
while($i<=20):
print $i;
$i++;
endwhile;
print '<br>';
//The difference between 'do while' and 'while' is: 'do while' will execute once at least.
//do while 和while的区别在于前者至少要执行一次
$i=0;
do {
echo $i;
}while($i>0);
echo '<p>';
//do while example 2
do {
if ($i < 5) {
echo "i is not big enough";
break;
}
$i *= 2;
if ($i < 50) {
break;
}
echo "i is ok";
/* process i */
} while (0);
//for(expression1; expression2; expression3) statement语句
//example1
for($i=0;$i<=6;$i++){
print $i;
}
echo '<br>';
//example2
for($i=0; ; $i++){
if($i>10){
break;
}
print $i;
}
echo '<br>';
//example3
for($i=0;;){
print $i;
$i++;
if($i>6){
break;
}
}
echo '<br>';
//example4
$i=0;
for(;;){
if($i>6){
break;
}
print $i;
$i++;
}
echo '<br>';
//example5
for($i=0;$i<=10;print $i, $i++);
echo '<p>';
//foreach语句
//example1
$arr = array('s','j','g','w','l');
foreach($arr as $value){
echo "$value<br>"; //$value is user-defined.
}
unset($value);
//list to replace foreach, same result
//使
