Php 检查函数是否返回某些内容

如果函数

validateCustomForm（）

不返回任何内容，则表示所有变量都已设置。我尝试使用

empty（）

，但我认为，由于函数中存在某些东西，它总是会返回false

如何检查函数是否返回内容？

---

您应该在函数中返回一些内容，而不是echo。如下

<?php

function validateCustomForm(){

$os0 = "";
$os1 = "5";
$os2 = "6";
$os3 = "5";
$error = false;
    if(!empty($os0)){
    //do nothing
    }else{
            $w = "width is missing";
    $error = true;
    }
    if(!empty($os1)){
    //do nothing
    }else{
            $h = "height is missing";
     $error = true;
    }
    if(!empty($os2)){
    //do nothing
    }else{
            $c = "color is missing";
     $error = true;
    }
    if(!empty($os3)){
    //do nothing
    }else{
            $q = "qty is missing";
     $error = true;
    }
    return $error;
    }//end function

$valid = validateCustomForm();

if(!empty($valid)){
echo "something is missing";
} else{
echo "all good";
}


?>

删除

回显

s，只返回要回显的值，否则为空，或者如果愿意，返回false。我看不到任何

返回

语句，因此

$valid

将始终为

空（
空
）当您谈论
return
时，函数Quick fix中必须有一个
return
语句：@Dagon我喜欢它。希望你能回答，这样我就可以接受你的回答。
<?php

function validateCustomForm(){

    $os0 = "";
    $os1 = "5";
    $os2 = "6";
    $os3 = "5";

    $errors = array();

    if(empty($os0)){
        $errors[] = "width is missing";
    }
    if(empty($os1)){
        $errors[] = "height is missing";
    }
    if(empty($os2)){
        $errors[] = "color is missing";
    }
    if(empty($os3)){
        $errors[] = "qty is missing";
    }
    if(!empty($errors)) {
        return $errors;
    }
    return TRUE;
}//end function

$valid = validateCustomForm();

if($valid !== TRUE){
    echo "something is missing: ";
    echo implode(',' , $valid);
} else{
   echo "all good";
}


?>

<?php

function validateCustomForm(){

$os0 = "";
$os1 = "5";
$os2 = "6";
$os3 = "5";
$error = false;
    if(!empty($os0)){
    //do nothing
    }else{
            $w = "width is missing";
    $error = true;
    }
    if(!empty($os1)){
    //do nothing
    }else{
            $h = "height is missing";
     $error = true;
    }
    if(!empty($os2)){
    //do nothing
    }else{
            $c = "color is missing";
     $error = true;
    }
    if(!empty($os3)){
    //do nothing
    }else{
            $q = "qty is missing";
     $error = true;
    }
    return $error;
    }//end function

$valid = validateCustomForm();

if(!empty($valid)){
echo "something is missing";
} else{
echo "all good";
}


?>