Single-precision floating-point format is a computer number format that occupies 4 bytes (32 bits) in computer memory and represents a wide dynamic range of values by using a floating point.

single_precision_floating_point_format.php

<?php

/*** 
 * Create a PHP function that takes an array of 32 boolean values
 * (zeroes and ones) as parameter, and answers with a numeric value.
 * The result value must be calculated by processing the array
 * parameter, which symbolizes an IEE-754 compliant Floating Point 
 * Single Precision 32bit value.
 * 
 * More docs @wikipedia: https://en.wikipedia.org/wiki/Single-precision_floating-point_format
 */

function compute($input) {

	#Checking length input
	if(count($input)==32) {

		#Getting reverse input to respect original equations
		$b = array_reverse($input);

		#Factor 1
		$factor1 = pow(-1,$b[31]);

		#Factor 2
		$significant_precision = 0;
		
		for($i=1;$i<24;$i++){ 
			$significant_precision += $b[23-$i]*pow(2,-$i);
		}

		$factor2 = 1 + $significant_precision;

		#Factor 3
		$exponent = 0;
		for($i=0;$i<7;$i++){ 
			$exponent += $b[23+$i]*pow(2,$i);
		}
		
		$factor3 = pow(2,($exponent-127));

		$result = $factor1*$factor2*$factor3;
		
		echo "Value = $factor1 x $factor2 x $factor3 = $result";
		
		return $result;

	}
	else
		echo "Wrong input, must to be 32 bits length!";
	
}

#Example from docs
$input = [0,0,1,1,1,1,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
$result = compute($input);

?>