PHP - $ x = 0 - 为什么它等于1？ [重复]

Question

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• The 3 different equals 5 answers

I have a few lines of code

$case=0;
file_put_contents("text.txt", $case, FILE_APPEND);
if ($case = 1)
{
    $message['a']="co"; 
}
if ($case = 0)
{
    $message['a']="to";
}
echo $message['a'];

It will echo "co". Why is this? The file_put contents puts "0". However the if statement thinks it is 1 for some reason...

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Answer 1

You are doing wrong in if condition. You doing assign instead of comparison.
So here is the solution.

$case=0;
file_put_contents("text.txt", $case, FILE_APPEND);
if ($case == 1)
{
    $message['a']="co"; 
}
if ($case == 0)
{
    $message['a']="to";
}
echo $message['a'];