PHP outputs hollow diamond php7 PHP environment construction PHP from entry to proficiency

php output hollow diamond:

<code><span>$a</span>=<span>5</span>;<span>/*控制循环行数*/</span><span>for</span>(<span>$i</span>=<span>1</span>;<span>$i</span>$a;<span>$i</span>++){ 
        <span>for</span>(<span>$b</span>=<span>1</span>;<span>$b</span>$a-<span>$i</span>;<span>$b</span>++){
            <span>echo</span><span>" "</span>;  
        }  
        <span>for</span>(<span>$c</span>=<span>1</span>;<span>$c</span>$i-<span>1</span>)*<span>2</span>+<span>1</span>;<span>$c</span>++){
            <span>if</span>(<span>$c</span>==<span>1</span>||<span>$c</span>==(<span>$i</span>-<span>1</span>)*<span>2</span>+<span>1</span>){
                <span>echo</span><span>"*"</span>;  
            }<span>else</span>{  
                <span>echo</span><span>" "</span>;  
            }  
        }
        <span>echo</span><span>"<br>"</span>;  
    }   
    <span>for</span>(<span>$i</span>=<span>$a</span>-<span>1</span>;<span>$i</span>>=<span>1</span>;<span>$i</span>--){ 
        <span>for</span>(<span>$b</span>=<span>1</span>;<span>$b</span>$a-<span>$i</span>;<span>$b</span>++){
            <span>echo</span><span>" "</span>;  
        } 
        <span>for</span>(<span>$c</span>=<span>1</span>;<span>$c</span>$i-<span>1</span>)*<span>2</span>+<span>1</span>;<span>$c</span>++){
            <span>if</span>(<span>$c</span>==<span>1</span>||<span>$c</span>==(<span>$i</span>-<span>1</span>)*<span>2</span>+<span>1</span>){
                <span>echo</span><span>"*"</span>;  
            }<span>else</span>{  
                <span>echo</span><span>" "</span>;  
            } 
        } 
        <span>echo</span><span>"<br>"</span>;  
    }</code>

output result:

').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });

The above introduces the hollow diamond output in PHP, including PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.