PHPデータパフォーマンスクイズ

今日、同僚が書いた PHP プログラムを見て、PHP 配列を定義する 2 つの方法のパフォーマンスの違いをテストしたいと思いました

簡単なテスト コードは次のとおりです:

1. 配列キーワードを使用します。

<?phpset_time_limit( 120 );echo time();for( $i = 0; $i < 10000000; ++$i ){	$arr = array( 'a' => 0,			'b' => 1,			'c' => 2,			'd' => 3,			'e' => 4,			'f' => 5,			'g' => 6,			'h' => 7,			'i' => 8,			'j' => 9,			'k' => 10,			'l' => 11,			'm' => 12,			'n' => 13,			'o' => 14,			'p' => 15,			'q' => 16,			'r' => 17,			's' => 18,			't' => 19,			'u' => 20,			'v' => 21,			'w' => 22,			'x' => 23,			'y' => 24,			'z' => 25,			'a1' => 0,			'b1' => 1,			'c1' => 2,			'd1' => 3,			'e1' => 4,			'f1' => 5,			'g1' => 6,			'h1' => 7,			'i1' => 8,			'j1' => 9,			'k1' => 10,			'l1' => 11,			'm1' => 12,			'n1' => 13,			'o1' => 14,			'p1' => 15,			'q1' => 16,			'r1' => 17,			's1' => 18,			't1' => 19,			'u1' => 20,			'v1' => 21,			'w1' => 22,			'x1' => 23,			'y1' => 24,			'z1' => 25	);}echo '<br>';echo time();exit();

実行時間: 1398407484 - 1398407432 = 52s

2. 配列キーワード

<?phpset_time_limit( 120 );echo time();for( $i = 0; $i < 10000000; ++ $i ){	$arr2 ['a'] = 0;	$arr2 ['b'] = 1;	$arr2 ['c'] = 2;	$arr2 ['d'] = 3;	$arr2 ['e'] = 4;	$arr2 ['f'] = 5;	$arr2 ['g'] = 6;	$arr2 ['h'] = 7;	$arr2 ['i'] = 8;	$arr2 ['j'] = 9;	$arr2 ['k'] = 10;	$arr2 ['l'] = 11;	$arr2 ['m'] = 12;	$arr2 ['n'] = 13;	$arr2 ['o'] = 14;	$arr2 ['p'] = 15;	$arr2 ['q'] = 16;	$arr2 ['r'] = 17;	$arr2 ['s'] = 18;	$arr2 ['t'] = 19;	$arr2 ['u'] = 20;	$arr2 ['v'] = 21;	$arr2 ['w'] = 22;	$arr2 ['x'] = 23;	$arr2 ['y'] = 24;	$arr2 ['z'] = 25;		$arr2 ['a1'] = 0;	$arr2 ['b2'] = 1;	$arr2 ['c2'] = 2;	$arr2 ['d2'] = 3;	$arr2 ['e2'] = 4;	$arr2 ['f2'] = 5;	$arr2 ['g2'] = 6;	$arr2 ['h2'] = 7;	$arr2 ['i2'] = 8;	$arr2 ['j2'] = 9;	$arr2 ['k2'] = 10;	$arr2 ['l2'] = 11;	$arr2 ['m2'] = 12;	$arr2 ['n2'] = 13;	$arr2 ['o2'] = 14;	$arr2 ['p2'] = 15;	$arr2 ['q2'] = 16;	$arr2 ['r2'] = 17;	$arr2 ['s2'] = 18;	$arr2 ['t2'] = 19;	$arr2 ['u2'] = 20;	$arr2 ['v2'] = 21;	$arr2 ['w2'] = 22;	$arr2 ['x2'] = 23;	$arr2 ['y2'] = 24;	$arr2 ['z2'] = 25;}echo '<br>';echo time();exit();

実行時間 1398407870 - 1398407832 = 38s

二人のパフォーマンスは巨大です

だから、配列を使用する場合は 1 行の定義を使用するのが最善です。これにより、より多くのコードを記述できるようになりますが、特に C プログラマーの場合、特にトラフィックの多い Web サイトでは、ある程度の高いパフォーマンスが得られます