If you've found this post you're probably, like I once did, experiencing problems with comparing floating point numbers in PHP. A section on the official PHP
// a function for comparing two float numbers // float 1 - The first number // float 2 - The number to compare against the first // operator - The operator. Valid options are =, <=, <, >=, >, <>, eq, lt, lte, gt, gte, ne function compareFloatNumbers($float1, $float2, $operator='=') { // Check numbers to 5 digits of precision $epsilon = 0.00001; $float1 = (float)$float1; $float2 = (float)$float2; switch ($operator) { // equal case "=": case "eq": { if (abs($float1 - $float2) < $epsilon) { return true; } break; } // less than case "<": case "lt": { if (abs($float1 - $float2) < $epsilon) { return false; } else { if ($float1 < $float2) { return true; } } break; } // less than or equal case "<=": case "lte": { if (compareFloatNumbers($float1, $float2, '<') || compareFloatNumbers($float1, $float2, '=')) { return true; } break; } // greater than case ">": case "gt": { if (abs($float1 - $float2) < $epsilon) { return false; } else { if ($float1 > $float2) { return true; } } break; } // greater than or equal case ">=": case "gte": { if (compareFloatNumbers($float1, $float2, '>') || compareFloatNumbers($float1, $float2, '=')) { return true; } break; } case "<>": case "!=": case "ne": { if (abs($float1 - $float2) > $epsilon) { return true; } break; } default: { die("Unknown operator '".$operator."' in compareFloatNumbers()"); } } return false; }