php基礎23：數值與數值函數

標籤：php基礎   自動   ber   ble   style   rand   _for   產生   數字   

<?php        //1.自動轉換    $a = 5;    $b = "5a";    $c = $a + $b;    echo $c;    echo "<br>";    $a = 5;    $b = "5a";    $c = $a.$b;    echo $c;    echo "<br>";    //1.（數值變數/數字字串）檢測    $a = 5;    $b = "5";    $c = "123";    echo is_numeric($a);    echo "<br>";    echo is_numeric($b);    echo "<br>";    //2. is_int() 和 is_float() is_double()    //3.產生隨機數 mt_rand()    $num = mt_rand();    echo $num;    echo "<br>";    $num1 = mt_rand(1, 100);    echo $num1;    echo "<br>";    //4.數字格式化    $num = 1234566776;    echo number_format($num);    echo "<br>";    $num1 = 223445.2334;    echo number_format($num1,2);    echo "<br>";    //5.數學函數、    $number1 = -555;    echo abs($number1);?>

 

php基礎23：數值與數值函數