# PHP Program - Cube Root of a Number

If a number is multiplied by itself two times (n*n*n), the final number will be the cube of that number and finding the cube root of a number is inverse operation of cubing the number. If x is the cube root of y, it can be expressed as below: Alternatively, it can also be expressed as:

x3 = y

### Method 1: Using exponent operator of PHP

The exponential (**) operator of PHP can be used to calculate the cube root of a number. Consider the following example.

```<?php
\$x = 64;
\$y = 125;

\$x1 = \$x**(1/3);
\$y1 = \$y**(1/3);
echo "Cube root of \$x is \$x1.\n";
echo "Cube root of \$y is \$y1.\n";
?>
```

The above code will give the following output:

```Cube root of 64 is 4.
Cube root of 125 is 5.
```

### Method 2: Using pow() function of PHP

The pow() function of PHP can also be used to calculate cube root of a number.

```<?php
\$x = 64;
\$y = 125;

\$x1 = pow(\$x, 1/3);
\$y1 = pow(\$y, 1/3);
echo "Cube root of \$x is \$x1.\n";
echo "Cube root of \$y is \$y1.\n";
?>
```

The above code will give the following output:

```Cube root of 64 is 4.
Cube root of 125 is 5.
```

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