PHP uses ternary function to judge the odd and even of the number of exceptions, ask how to solve

PHP uses ternary function to determine the parity of the number of errors, how to solve
Parse error:syntax error, unexpected ' echo ' (T_echo) in F:\xampp\htdocs\test\test02.php on line 26 This is the error description,

Here is the source code:
for ($a =0; $a <10; $a + +) {
With the ternary operation output, if no remainder is an even number,
Otherwise an odd number
echo $a%2==0? $a. " is an even number "." \ n ": $a." is an odd number "." \ n ";
}
?>
------to solve the idea----------------------
Otherwise an odd number
------to solve the idea----------------------
for ($a =0; $a <10; $a + +) {
Output with ternary operation, if no remainder is an even number, otherwise an odd number
echo $a%2==0? $a. " is an even number "." \ n ": $a." is an odd number "." \ n ";
}

------to solve the idea----------------------

for ($a =0; $a <10; $a + +) {    
  With the ternary operation output, if no remainder is an even number,
        Otherwise an odd number      
    
}  

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