Question

<?php 
    foreach ($myassignment->result() as $e){
        $courseId=$e->courseId;
        $getassign=$this->Usermodel->getmysubassignment($courseId);     

        if($getassign->num_rows()==''){
            print_r('no rows');
        } else {
            print_r('some rows');
        }                           
    }
?>

在上面的代码中，$ myassignment包含2个courseId＆＃39; s。在第一个课程中，我不会使用$getassign=$this->Usermodel->getmysubassignment($courseId);从DB返回任何内容，而第二个返回内容。但它打印no rows和some rows，但我只需要some rows。怎么办？

Answer 1

您无法对循环的未来迭代作出反应。只需将输出移出循环：

#attempt at Guess Who!

import random

class Character:
    def __init__(self, g, h, e, s, n):
        self.hasGlasses = g
        self.hairColor = h
        self.eyeColor = e
        self.gender = s
        self.name = n

    def __repr__(self):
        return "{}, {},  {} eyes, {} glasses, {} hair".format(self.name, self.gender, self.eyeColor, self.hasGlasses, self.hairColor)

    def checkEC(self, x):
        result = False
        if (self.eyeColor.lower() == str(x).lower()):
            result = False
        return result

    def checkGlasses(self, x):
        result = False
        if (self.hasGlasses.lower() == str(x).lower()):
            result = True
        return result

    def checkHC(self, x):
        result = False
        if (self.hairColor.lower() == str(x).lower()):
            result = True
        return result

    def checkG(self, x):
        result = False
        if (self.gender.lower() == str(x).lower()):
            result = True
        return result

possibleChars = []

rob = Character("yes", "blonde", "green", "boy", "Rob")
possibleChars.append(rob)
susan = Character("no", "red", "blue", "girl", "Susan")
possibleChars.append(susan)
pat = Character("no", "brown", "brown", "boy", "Pat")
possibleChars.append(pat)
shane = Character("no", "brown", "blue", "boy", "Shane")
possibleChars.append(shane)
ben = Character("no", "blonde", "green", "boy", "Ben")
possibleChars.append(ben)
angello = Character("yes", "blonde", "hazel", "girl", "Angelica")
possibleChars.append(angello)
questions = ["What color is your hair? ", "Do you wear glasses? ", "Are you a boy or a girl? ",
"What color are your eyes? "
];

counter = 0
guessed = False
qsAsked = []
charsLeft = []
for i in possibleChars:
    print(i)


while not guessed:
    y = random.randint(0, len(questions) - 1)
    print(int(y))

    if (counter == 0):

        if (y in qsAsked):
            guessed = False

        elif(y == 0):
            x = input(questions[int(y)])
            for character in possibleChars:
                if (character.checkHC(str(x))):
                    charsLeft.append(character)
            qsAsked.append(0)
            for i in possibleChars:
                print(i)
            counter = counter + 1


        elif(y == 1):
            x = input(questions[int(y)])
            for character in possibleChars:
                if (character.checkGlasses(str(x))):
                    charsLeft.append(character)
            qsAsked.append(1)
            for i in possibleChars:
                print(i)
            counter = counter + 1

        elif(y == 2):
            x = input(questions[int(y)])
            for character in possibleChars:
                if (character.checkG(str(x))):
                    charsLeft.append(character)
            qsAsked.append(2)
            for i in possibleChars:
                print(i)
            counter = counter + 1

        elif(y == 3):
            x = input(questions[int(y)])
            for character in possibleChars:
                if (character.checkEC(str(x))):
                    charsLeft.append(character)
            qsAsked.append(3)
            for i in possibleChars:
                print(i)
            counter = counter + 1

    elif (counter > 0) :
        if (y in qsAsked):
            guessed = False

        elif(y == 0):
            x = input(questions[int(y)])
            for character in charsLeft:
                if (not character.checkHC(str(x))):
                    charsLeft.remove(character)
            if (len(charsLeft) == 1):
                print("Your character must be {}!".format(charsLeft[0]))
                guessed = True
            qsAsked.append(0)
            for i in charsLeft:
                print(i)



        elif(y == 1):
            x = input(questions[int(y)])
            for character in charsLeft:
                if (not character.checkGlasses(str(x))):
                    charsLeft.remove(character)
            if (len(charsLeft) == 1):
                print("Your character must be {}!".format(charsLeft[0]))
                guessed = True
            qsAsked.append(1)
            for i in charsLeft:
                print(i)

        elif(y == 2):
            x = input(questions[int(y)])
            for character in charsLeft:
                if (not character.checkG(str(x))):
                    charsLeft.remove(character)
            if (len(charsLeft) == 1):
                print("Your character must be {}!".format(charsLeft[0]))
                guessed = True
            qsAsked.append(2)
            for i in charsLeft:
                print(i)


        elif(y == 3):
            x = input(questions[int(y)])
            for character in charsLeft:
                if (not character.checkEC(str(x))):
                    charsLeft.remove(character)
            if (len(charsLeft) == 1):
                print("Your character must be {}!".format(charsLeft[0]))
                guessed = True
            qsAsked.append(3)
            for i in charsLeft:
                print(i)

Answer 2

使用flag代替

$flag = FALSE;// set if false
    foreach ($myassignment->result() as $e) {
        $courseId = $e->courseId;
        $getassign = $this->Usermodel->getmysubassignment($courseId);

        if ($getassign->num_rows() > 0) {
            $flag = TRUE;// if row then set it true
        }
    }// end of foreach loop
    if ($flag) {
        print_r('some rows');
    } else {
        print_r('no rows');
    }

foreach打印两个结果

2 个答案: