PHP输出一个等腰三角形的方法

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function isosceles($line,$sing){

$tab ='=';

for($i=1;$i

$blank = print_blank($i,$line,$tab);

$code = print_code($i,$sing);

echo $blank.$code.$blank."
";

}

}

function print_blank($num,$line,$tab){

$blank ='';

for($i=$num;$i

$blank.=$tab;

}

return $blank;

}

function print_code($num,$sing){

$code ='';

for($i=0;$i

$code.=$sing;

}

return $code;

}

$line = 5;

$sing = "*";

isosceles($line,$sing);