檢查函數是否返回

Question

如果函數validateCustomForm()不返回任何內容，則表示所有變量均已設置。我嘗試使用empty()，但我想，因爲在函數中有東西會一直返回false。

如何檢查一個函數是否返回一些東西？

Script in action here

<?php 

function validateCustomForm(){ 

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

    }//end function 

$valid = validateCustomForm(); 

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


?> 

Answer 1

<?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"; 
} 


?> 

Answer 2

你應該返回函數，而不是回聲東西。像下面

<?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"; 
} 


?>