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PHP Math functions is_nan

We can check a input or variable is a number or not by using is_nan function. Note that we can't check a string with this function.
We can check square root of a negative number with is_nan function. Here is a sample code to check.

$v = acos(1.1);
if(is_nan($v)){
echo "this is not a number";
}else{
echo "this is a number";
}

Out put is

this is not a number

You can change the line $v=acos(1.1) with different values of variable $v and see the result.

$v=5.23; // this is a number
$v=4; // this is a number

PHP Math Functions
PHP Math Functions \|Addition Subtraction \|Maximum and Minimum numbers \|PHP Round \| Random number generator \| NUmber Formatting \| Ceil and floor value of a number \| Modulus or reminder

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Math Functions

Math Functions Addition max() min() Rounding Number Random number Number formatting ceil & floor square root is_nan abs() Modulus (%)

PHP Math functions is_nan

$v = acos(1.1); if(is_nan($v)){ echo "this is not a number"; }else{ echo "this is a number"; }

this is not a number

$v=5.23; // this is a number $v=4; // this is a number

$v = acos(1.1);
if(is_nan($v)){
echo "this is not a number";
}else{
echo "this is a number";
}

$v=5.23; // this is a number
$v=4; // this is a number