PHP big data addition

<code><span><span>function</span><span>add</span><span>(<span>$a</span>,<span>$b</span>)</span>{</span><span>$a</span> = strrev(<span>$a</span>);
    <span>$b</span> = strrev(<span>$b</span>);
    <span>$tmp</span> = <span>0</span>;
    <span>$tmp_c</span> = <span>0</span>;
    <span>$count</span> = <span>''</span>;
    <span>$len</span> = strlen(<span>$a</span>)>strlen(<span>$b</span>)?strlen(<span>$a</span>):strlen(<span>$b</span>);
    <span>for</span>(<span>$i</span>=<span>0</span>;<span>$i</span><<span>$len</span>;<span>$i</span>++){
        <span>if</span>(<span>isset</span>(<span>$a</span>[<span>$i</span>]) && <span>isset</span>(<span>$b</span>[<span>$i</span>])){
            <span>$tmp_c</span> = <span>$a</span>[<span>$i</span>] + <span>$b</span>[<span>$i</span>] + <span>$tmp</span>;
            <span>if</span>(<span>$tmp_c</span> > <span>10</span>) {
                <span>$tmp</span> = <span>1</span>;
                <span>$count</span> = substr(<span>$tmp_c</span>,<span>1</span>).<span>$count</span>;
            } <span>else</span> {           
                <span>$tmp</span> = <span>0</span>;      
                <span>$count</span> = <span>$tmp_c</span>.<span>$count</span>;
            }           
        } <span>elseif</span>(<span>isset</span>(<span>$a</span>[<span>$i</span>])) {
            <span>$tmp_c</span> = <span>$a</span>[<span>$i</span>] + <span>$tmp</span>;
            <span>if</span>(<span>$tmp_c</span> > <span>10</span>) {
                <span>$tmp</span> = <span>1</span>; 
                <span>$count</span> = substr(<span>$tmp_c</span>,<span>1</span>).<span>$count</span>;
            } <span>else</span> {      
                <span>$tmp</span> = <span>0</span>; 
                <span>$count</span> = <span>$tmp_c</span>.<span>$count</span>;
            }             
        } <span>elseif</span>(<span>isset</span>(<span>$b</span>[<span>$i</span>])) {
            <span>$tmp_c</span> = <span>$b</span>[<span>$i</span>] + <span>$tmp</span>;
            <span>if</span>(<span>$tmp_c</span> > <span>10</span>) {
                <span>$tmp</span> = <span>1</span>; 
                <span>$count</span> = substr(<span>$tmp_c</span>,<span>1</span>).<span>$count</span>;
            } <span>else</span> {      
                <span>$tmp</span> = <span>0</span>; 
                <span>$count</span> = <span>$tmp_c</span>.<span>$count</span>;
            }             
        }                 
    }                     
    <span>return</span><span>$count</span>;        
}</code>

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The above introduces PHP big data addition, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.