<?php
/**
* @author yusaint
* @copyright 2011
*/
function cal($expr)
{
$splittedBy_multi = explode('*', $expr); // (12/3) (2) (12) (12/4)
$temp = array();
print_r($splittedBy_multi);
foreach ($splittedBy_multi as $k => $v) {
$splittedBy_divided = explode('/', $v);
if (count($splittedBy_divided) > 1) {
$temp[$k] = intval($splittedBy_divided[0]) * intval($splittedBy_divided[0]);
foreach ($splittedBy_divided as $val) {
$temp[$k] /= intval($val);
}
} else
$temp[$k] = intval($v);
}
return array_product($temp);
}
$expr = "10-4+123+100*98*8/100*4*3+3-12/3/4*2*12*12/4+4-8+12/3*12+12";
$splittedBy_plus = explode('+', $expr); //0=>(4*3) 1=>(3-12/3/4*2*12*12/4) 2=>(4-8)
$temp = array();
foreach ($splittedBy_plus as $k => $v) {
$splittedBy_minus = explode('-', $v); // 3 12/3/4*2*12*12/4
if (count($splittedBy_minus) > 1) //(3) (12/3/4*2*12*12/4) (4) (8)
{
$temp_minus = array();
foreach ($splittedBy_minus as $key => $value) {
$temp_minus[$key] = cal($value);
}
$minus = 2 * $temp_minus[0];
foreach ($temp_minus as $value) {
$minus -= (int)$value;
}
$temp[$k] = $minus;
} else {
$temp[$k] = cal($v);
}
}
$sum = 0;
foreach ($temp as $value) {
$sum += $value;
}
echo 'the parsed value is:' . $sum."\n";
echo 'the original value is:'.(10-4+123+100*98*8/100*4*3+3-12/3/4*2*12*12/4+4-8+12/3*12+12);
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