php-logic-1

Compare these two sorting algorithms to implement reordering of ordered arrays

1. Define two pointers$a,$b

2. Use PHP’s built-in function

<code><span><span><?php</span><span>$array_a</span> = <span>array</span>(<span>2</span>,<span>5</span>,<span>7</span>);
    <span>$array_b</span> = <span>array</span>(<span>1</span>,<span>2</span>,<span>3</span>,<span>8</span>,<span>9</span>);
    <span>$length_a</span> = count(<span>$array_a</span>);
    <span>$length_b</span> = count(<span>$array_b</span>);
    <span>$array_c</span> = <span>array</span>();
    <span>$a</span> = <span>0</span>;
    <span>$b</span> = <span>0</span>;
    <span>$time_a</span> = microtime(<span>true</span>);
    <span>while</span>(<span>true</span>){
        <span>if</span>(<span>$a</span> == <span>$length_a</span> || <span>$b</span> == <span>$length_b</span>)
            <span>break</span>;
        <span>if</span>(<span>$array_a</span>[<span>$a</span>] <= <span>$array_b</span>[<span>$b</span>]){
            <span>$array_c</span>[] = <span>$array_a</span>[<span>$a</span>];
            ++<span>$a</span>;
        }<span>else</span>{
            <span>$array_c</span>[] = <span>$array_b</span>[<span>$b</span>];
            ++<span>$b</span>;
        }
    }
    <span>if</span>(<span>$a</span> == <span>$length_a</span>){
        <span>while</span>(<span>$b</span> < <span>$length_b</span>){
            <span>$array_c</span>[] = <span>$array_b</span>[<span>$b</span>++];
        }
    }
    <span>else</span>{
        <span>while</span>(<span>$a</span> < <span>$length_a</span>){
            <span>$array_c</span>[] = <span>$array_a</span>[<span>$a</span>++];
        }
    }
    <span>//var_dump($array_c);</span><span>$result_a</span> = microtime(<span>true</span>) - <span>$time_a</span>;

<span>//2.</span><span>$time_b</span> = microtime(<span>true</span>);
    <span>$array_c</span> = <span>array</span>();
    <span>$array_c</span> = array_merge(<span>$array_a</span>, <span>$array_b</span>);
    sort(<span>$array_c</span>);
    <span>//var_dump($array_c);</span><span>$result_b</span> = microtime(<span>true</span>) - <span>$time_b</span>;

    <span>echo</span> (<span>$result_b</span> - <span>$result_a</span>) > <span>0</span> ? <span>1</span> : <span>0</span>; 
<span>?></span></span></span></code>

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