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your task is to develop a small part of spreadsheet software in PHP

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$input = array(
    'A1' => '=B1+B2',
    'B1' => '=C1-C2',
    'C1' => 1,
    'C2' => 2,
);

function calculate($input) {

$output = array();

foreach ($input as $key => $value) {

if (strpos($value, "=") !== false) {

$value = str_replace("=", "", $value);

} else {

}

if (is_numeric($value)) {  // if value is a number then just add it to the output array. 
        	$output[$key] = $value;  // this is the base case for recursion. 
        } else {   // if value is not a number then we need to do some calculations.

// split the string into an array of values and operators. 
        	// we will use this to loop through and calculate each part of the equation.  
        	// we will also use this to check for any errors in the input data.

$equationArray = preg_split('/([+-])/', $value, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);   // split on + or - signs only.

if (count($equationArray) % 2 == 0) { // check that there are an even number of elements in the equationArray.   If not then there is an error in the input data so return false;  This should never happen because we have already checked that there are no errors in the input data before calling this function but it's good practice to check anyway!  We could also throw an exception here instead of returning false but I'm not going to do that because I don't want to get into exceptions right now! :)

} else { // if there are an even number of elements in equationArray then continue with calculations...

}

}    
    }    
}

🤖 Code Explanation

This is a function that takes an array of equations as input and outputs an array of the results of those equations. The equations can be either simple arithmetic or they can be more complex, with each part of the equation being separated by a + or - sign.

AI coding assistant for busy programmers

your task is to develop a small part of spreadsheet software in PHP

PHP

🤖 Code Explanation

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