<?php
$value = 0;
switch ($value) {
case $value < 3:
$output = 'smaller than 3';
break;
case $value >= 3 && $value <= 4:
$output = 'between 3 and 4 (inclusively)';
break;
case $value >= 5 && $value <= 6:
$output = 'between 5 and 6 (inclusively)';
break;
case $value >= 6 && $value <= 7:
$output = 'between 6 and 7 (inclusively)';
break;
}
echo $output;
?>
为什么这个输出between 3 and 4 (inclusively)而不是smaller than 3？
......
switch()应该true但您的$value 0。零被视为false。对于条件，您可以简单地使用 if 然后elseif .试试这个..
$value = 0;
if($value < 3){
$output = 'smaller than 3';
}elseif($value >= 3 && $value <= 4){
$output = 'between 3 and 4 (inclusively)';
}elseif($value >= 5 && $value <= 6){
$output = 'between 5 and 6 (inclusively)';
}elseif($value >= 6 && $value <= 7){
$output = 'between 6 and 7 (inclusively)';
}
echo $output;
输出： smaller than 3