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                ### mt_getrandmax (PHP 4, PHP 5, PHP 7) mt_getrandmax — 顯示隨機數的最大可能值 #### 說明 ? int mt_getrandmax ( void ) 返回調用 mt_rand() 所能返回的最大的隨機數。 #### 返回值 ? 返回調用 mt_rand() 所能返回的最大的隨機數。 #### 范例 ? Example #1 計算一個隨機浮點數 ~~~ <?php function randomFloat($min = 0, $max = 1) { return $min + mt_rand() / mt_getrandmax() * ($max - $min); } var_dump(randomFloat()); var_dump(randomFloat(2, 20)); ?> ~~~ 以上例程的輸出類似于: ~~~ float(0.91601131712832) float(16.511210331931) ~~~ var_dump(mt_getrandmax()); int(2147483647)
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