comparison in php using == and === operators

Question

In my application, there are values generated at run time like x, 1x,2,1 etc. I need to compare these:

as we know,

        x  == 1  is false   
       '1x'== 1  is true
       '1' == 1  is true

for my application, the first,second cases needs to be false and third needs to be true. if I use ===,

       x  === 1    is false   
      '1x'=== 1    is false   
      1'  === 1    is false

So both these comparisons i can not use.

I think converting to string and then comparing using strcmp will be the best option I have. Please share your thoughts. Any reply is appreciated.

Why don't you just compare '1' === '1', i.e. surround the 1 with single quotes? — danmullen
– danmullen, Commented Oct 28, 2014 at 11:48
== are used to compare values if they are equal and it is less strict than ===. — Robin
– Robin, Commented Oct 28, 2014 at 11:52
I can not do this because all these are generated at run time and no control over values generated. Do you mean to append '' for all and compare? if so it work as it compare everything as string. so is that better way or using strcmp? — AVC
– AVC, Commented Oct 28, 2014 at 11:53
=== are used to compare two values and also sees that both the values have the same data-type. === is more better to use than == if you want your values to match exactly. — Robin
– Robin, Commented Oct 28, 2014 at 11:54
this is how php comparision works.... don't like it? change the language perhaps? — itachi
– itachi, Commented Oct 28, 2014 at 11:55

Sougata Bose · Accepted Answer · 2014-10-28 11:55:40Z

4

strcmp would be suitable for this.But you should be aware of its return values.

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

or you can also use Regex

answered Oct 28, 2014 at 11:55

Sougata Bose

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2 Comments

AVC Over a year ago

thanks, even i was having the same opinion. will wait for some other views also now

Sougata Bose Over a year ago

hmm..its little complicated.

Apul Gupta · Accepted Answer · 2014-10-28 12:08:17Z

3

Use either strcmp or strcasecmp:

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

edited Oct 28, 2014 at 12:08

answered Oct 28, 2014 at 11:57

Apul Gupta

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1 Comment

Apul Gupta Over a year ago

@AVC For case insensitive search, use strcasecmp as mentioned in answer.

Robin · Accepted Answer · 2014-10-28 12:29:48Z

0

Please try the following :

if(strlen($x) == 1) {
    if ((intval($x) === 1)) {
        echo "Equals";
    }
    else
   {
        echo "Not Equals";
   }
}
   }else
   {
       echo "Not Equals";
   }

edited Oct 28, 2014 at 12:29

answered Oct 28, 2014 at 12:16

Robin

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