字符串比较在php中不起作用

Question

I'm very new to php. I have a json named json . When I try to do this:

echo $json->status;

I get :

CREATED

I try to compare this result with normal string CREATED like this:

if(strcasecmp("CREATED",$json->status))
{
    print_r("Order created successfuly");
}

but for some reason the if condition is not evaluting to true . Even though I compare CREATED with CREATED !

Not sure where the error is.

Thanks in advance.

Answer 1

如果字符串相等，此函数返回零

if (strcasecmp("CREATED",$json->status) == 0)

Answer 2

Look to the manual :

Returns < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal.

so strcasecmp('a','a') is 0 , therefore you have to change your code into

if(strcasecmp("CREATED",$json->status) == 0)
{
    print_r("Order created successfuly");
}

Answer 3

http://php.net/manual/en/function.strcasecmp.php

Quote from the page :

Returns < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal.

So strcasecmp('CREATED', 'CREATED') returns 0 . And 0 is not equals to true . You must do that :

if (strcasecmp("CREATED",$json->status) === 0) {
    print_r("Order created successfuly");
}

Answer 4

if (strcasecmp( $json->status, "CREATED") == 0) 
{
...
...

}

Answer 5

Why cant you just use a simpler if statement?

if( $json->status == "CREATED" ) {
    print_r("Order created successfuly");
}

And check for whitespaces at the end or start of the status.

Answer 6

To compare strings, try to do the following :

if($json->status == "CREATED")
{
   echo "Order created successfuly";
}