Phpif judgment problems.

I have a php record to check whether there is a more concise way of writing, or you can use other methods to implement {code ...} there is a php judge to see if there is a more concise writing method, or other methods can be implemented.

$cat_id = 0;if(empty($a)){    if(empty($b)){        if(empty($c)){            return 0;            exit();        }else{            $cat_id = $c;        }    }else{        $cat_id = $b;    }}else{    $cat_id = $a;}

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There is a php judge to see if there is a more concise writing method, or other methods can be implemented.

$cat_id = 0;if(empty($a)){    if(empty($b)){        if(empty($c)){            return 0;            exit();        }else{            $cat_id = $c;        }    }else{        $cat_id = $b;    }}else{    $cat_id = $a;}

$ Cat_id = $? : $ B? : $ C? : 0; // PHP version requirements

Like writing this, no nesting

$cat_id = 0;if($a) {    $cat_id = $a;    return;}if($b) {    $cat_id = $b;    return;}if($c) {    $cat_id = $c;    return;}return;

$ Cat_id = $? $ A: ($ B? $ B: ($ c? $ C: 0 ));

$cat_id = 0;if (!empty($a)) {    $cat_id = $a;} elseif (!empty($b)) {    $cat_id = $b;} elseif (!empty($c)) {    $cat_id = $c;} else {    return 0;}

function test($a, $b, $c){    if (empty($a)) {        if (empty($b)) {            if (empty($c)) {                return 0;            }            return $c;        }        return $b;    }    return $a;}$cat_id = test($a, $b, $c);

There should be no simpler writing method, but it can be optimized

$cat_id = 0;if (! empty($c)) $cat_id = $c;if (! empty($b)) $cat_id = $b;if (! empty($a)) $cat_id = $a;if (empty($cat_id)) exit;

    function checkEmpty($a, $b = '', $c = ''){        if(empty($b) && empty($c)) exit();        return empty($a) ? checkEmpty($b,$c) : $a;    }

This should be concise enough!

$cat_id = 0;while(1){    if(empty($a)){        $cat_id = $a;        break;    }    if(empty($b)){        $cat_id = $b;        break;    }    if(empty($c)){        $cat_id = $c;        break;    }}

Just do not write nesting.

High readability

Simplified and traditional