PHP take the whole function ceil, floor, round, intval usage difference

echo ceil (4.3); 5 echo ceil (9.999); 10 ?> Copy Code 2, floor-to take the whole method of rounding the float floor (float $value) returns the next integer not less than value, rounding out the fractional part of value. The type returned by floor () is still float, because the range of float values is usually larger than the integer. Floor () example echo floor (4.3); 4 echo Floor (9.999); 9 ?> Copy Code 3, round-The floating-point number to round the description float round (float $val [, int $precision]) Returns the result of rounding Val based on the specified precision precision (number of digits after decimal decimal point). Precision can also be negative or 0 (the default value). Round () example Echo round (3.4); 3 Echo round (3.5); 4 Echo round (3.6); 4 Echo Round (3.6, 0); 4 Echo Round (1.95583, 2); 1.96 Echo Round (1241757,-3); 1242000 Echo Round (5.045, 2); 5.05 Echo Round (5.055, 2); 5.06 ?> Copy Code Description: PHP does not correctly handle strings like "12,300.2″" by default. Description: The precision parameter was introduced in PHP 4. 4. intval-gets the integer value of the variable description int intval (mixed $var [, int $base]) returns the integer value of the variable var by using a specific binary conversion (by default, decimal). var can be any scalar type. Intval () cannot be used with an array or object. Intval () example echo intval (4.3); 4 echo intval (9.999); 9 ?> Copy Code Description: The base parameter of Intval () will not be effective unless the var argument is a string. Summary: The floor function is functionally the same as the Intval function, with the difference being one returned floating point number (float) and the other being an integer, because the range of float values is usually larger than the integer. However, the values themselves are equal.

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