带有多个条件的 PHP If 语句
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PHP If Statement with Multiple Conditions
提问by blasteralfred Ψ
I have a variable$var.
我有一个变量$var。
I want echo "true"if $varis equal to any of the following values abc, def, hij, klm, or nop. Is there a way to do this with a single statement like &&??
我想要 echo "true"if$var等于以下任何值abc，def，hij，klm， 或nop。有没有办法用像&&??这样的单个语句来做到这一点。
回答by Pekka
An elegant way is building an array on the fly and using in_array():
一种优雅的方法是动态构建数组并使用in_array()：
if (in_array($var, array("abc", "def", "ghi")))
The switchstatementis also an alternative:
该switch语句也是一个替代方案：
switch ($var) {
case "abc":
case "def":
case "hij":
echo "yes";
break;
default:
echo "no";
}
回答by Tokk
if($var == "abc" || $var == "def" || ...)
{
echo "true";
}
Using "Or" instead of "And" would help here, i think
我认为使用“或”而不是“和”会有所帮助
回答by Shakti Singh
you can use in_array function of php
你可以使用 php 的 in_array 函数
$array=array('abc', 'def', 'hij', 'klm', 'nop');
if (in_array($val,$array))
{
echo 'Value found';
}
回答by KingCrunch
Dont know, why you want to use &&. Theres an easier solution
不知道，为什么要使用&&. 有一个更简单的解决方案
echo in_array($var, array('abc', 'def', 'hij', 'klm', 'nop'))
? 'yes'
: 'no';
回答by sauerburger
you can use the boolean operator or: ||
您可以使用布尔运算符或： ||
if($var == 'abc' || $var == 'def' || $var == 'hij' || $var == 'klm' || $var == 'nop'){
echo "true";
}
回答by Osh Mansor
You can try this:
你可以试试这个：
<?php
echo (($var=='abc' || $var=='def' || $var=='hij' || $var=='klm' || $var=='nop') ? "true" : "false");
?>
回答by IC360 Oliver Cannell
I found this method worked for me:
我发现这种方法对我有用：
$thisproduct = "my_product_id";
$array=array("$product1", "$product2", "$product3", "$product4");
if (in_array($thisproduct,$array)) {
echo "Product found";
}
回答by paul
Try this piece of code:
试试这段代码：
$first = $string[0];
if($first == 'A' || $first == 'E' || $first == 'I' || $first == 'O' || $first == 'U') {
$v='starts with vowel';
}
else {
$v='does not start with vowel';
}
回答by Owais Akber
It will be good to use array and compare each value 1 by 1 in loop. Its give advantage to change the length of your tests array. Write a function taking 2 parameters, 1 is test array and other one is the value to be tested.
最好使用数组并在循环中 1 x 1 比较每个值。它可以改变测试数组的长度。编写一个带2个参数的函数，1个是测试数组，另一个是要测试的值。
$test_array = ('test1','test2', 'test3','test4');
for($i = 0; $i < count($test_array); $i++){
if($test_value == $test_array[$i]){
$ret_val = true;
break;
}
else{
$ret_val = false;
}
}
回答by Orgmir
I don't know if $var is a string and you want to find only those expressions but here it goes either way.
我不知道 $var 是否是一个字符串，而您只想找到那些表达式，但无论哪种方式都可以。
Try to use preg_match http://php.net/manual/en/function.preg-match.php
尝试使用 preg_match http://php.net/manual/en/function.preg-match.php
if(preg_match('abc', $val) || preg_match('def', $val) || ...)
echo "true"
