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PHP Constant expression contains invalid operations new stdClass Error

I got this PHP error of “Constant expression contains invalid operations”.

This is due to a function variable default value of new stdClass()

public function add(string $name, object $contents = new stdClass()){
/*
function definition
*/
}

public function add(string $name, object $contents = new stdClass()){

function definition

}

This happens on PHP version 8.0.30 on my hosting server.

This errors doesn’t appear on my development laptop which is version 8.2.4.

Solution

I put “null” instead of “new stdClass()” and then set it to new stdClass if the variable is null.

public function add(string $name, object $contents = null){
if($contents == null):
   $contents = new stdClass();
endif;
/* function definition */ }

public function add(string $name, object $contents = null){

if($contents == null):

$contents = new stdClass();

endif;

/* function definition */ }

Periksa Cukai Taksiran Tertunggak Rumah Lelong

Kebanyakan rumah lelong, pembida yang berjaya perlu membayar cukai taksiran yang tertunggak terlebih dahulu sebelum bank yang lelong rumah bayar balik kepada pembida yang berjaya.

Oleh yang demikian, pembida perlulah periksa cukai taksiran yang tertunggak untuk kita sediakan wang tunai yang secukupnya.

Bagaimana Memeriksa Cukai Taksiran Tertunggak Rumah Lelong di Kawasan Majlis Bandaraya Shah Alam?

1) Ambil no Hakmilik dari POS

Rumah lelong disertakan sekali Proclamation of Sales (POS). Dalam POS ada nombor hakmilik.

rumah lelong contoh no hakmilik dari POS

2) Kemudian login ke MyMBSA

https://www.mymbsa.gov.my/

3) Buat carian Maklumat Harta

Klik myCukai -> Senarai Carian Maklumat Harta -> Permohonan Baharu

mbsa - carian maklumat harta — mbsa – carian maklumat harta

4) Masukkan Maklumat Harta – nombor Hakmilik

Klik seterusnya untuk maklumat peribadi.

carian maklulmat harta - maklumat peribadi — carian maklulmat harta – maklumat peribadi

Pastikan D ada kurungan contoh HS(D) dan space antarata (D) dengan nombor hakmilik untuk memastikan anda berjaya membuat carian harta.

pastikan hakmilik ada kurungan pada huruf D

Jika berjaya anda akan menjumpai harta yang dicari dan boleh memilih maklumat yang dikehendaki iaitu

i) Carian Maklumat

ii) Penyata Cukai

iii) Bil Cukai

Satu laporan akan dikenakan caj RM20.

jika carian harta berjaya maklumat harta akan dipaparkan

5) Selepas Membuat Bayaran Anda Akan Dapat Melihat Maklumat Harta

Maklumat harta boleh dipaparkan selepas klik setiap laporan (rujuk garis hijau)

maklumat harta klik untuk paparan -garis hijau

Contoh-contoh Maklumat Harta Yang Anda Boleh Dapat

i.Maklumat Harta

ii. Penyata Cukai

iii. Bil Cukai

OpenCV findContours – What it is?

OpenCV findContours detects change in the image color and marked it as contour.

In this example using archery target face, findContours detects the outer circle, yellow circle, bullseye circle, logos on top left and bottom left.

In this case, findContours doesn’t detect the red circle contour.

The Original Image

The Image Gray

The Find Contours Image

Green color is the contours found on the image.

opencv findcontours on archery target face

The OpenCV Python Code

import os
import cv2 as cv
import numpy as np
import matplotlib.pyplot as plt


def findContours():
    root = os.getcwd()
    imgPath = os.path.join(root, 'images/target.jpg')
    img = cv.imread(imgPath)
    #change to GRAY to easily detect the contours
    imgGray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)

    ret, thresh = cv.threshold(imgGray, 127, 255, 0)
    contours, hierarchy = cv.findContours(thresh, cv.RETR_TREE, cv.CHAIN_APPROX_SIMPLE)


    imgContours = cv.drawContours(img, contours, -1, (0,255,0), 3)

    plt.figure()
    plt.subplot(121)
    plt.imshow(imgContours)
  
    plt.show()

    

if __name__ == '__main__':    
    print("Start")
    findContours()

import os

import cv2 as cv

import numpy as np

import matplotlib.pyplot as plt

def findContours():

root = os.getcwd()

imgPath = os.path.join(root, 'images/target.jpg')

img = cv.imread(imgPath)

#change to GRAY to easily detect the contours

imgGray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)

ret, thresh = cv.threshold(imgGray, 127, 255, 0)

contours, hierarchy = cv.findContours(thresh, cv.RETR_TREE, cv.CHAIN_APPROX_SIMPLE)

imgContours = cv.drawContours(img, contours, -1, (0,255,0), 3)

plt.figure()

plt.subplot(121)

plt.imshow(imgContours)

plt.show()

if __name__ == '__main__':

print("Start")

findContours()

Conclusion

findContours is an easy way to automatically detect an image shape or outline.

References:

OpenCV Python Image Perspective Transform

I wanted to learn OpenCV Perspective Transform. Tutorials that I found on the internet bit complex for me to really understand what it is all about. I have to read few tutorials before really understand it.

In layman term, perspective transform is taking a rectangle area from original image and re-project the cut rectangle to our defined size canvas.

To do this, you just need 4 corner pixel points and perspective transform will do all other pixels calculation automatically based on those 4 pixels points.

The Required Pixel Points

The corner pixels points must follow the order as shown in below image.

This is considered the source pixel points.

The destination points are where you want to re-project those source points into new plane.

The size of destination plane is:

width: 1000 pixels
height: 200 pixels

I just take the source rectangle width and height.

Image Used for the Perspective Transform

I used below image to do the perspective transform.

Code on Perspective Transform

Filename: Main.py

import os
import cv2 as cv
import numpy as np
import matplotlib.pyplot as plt

def perspectiveTransform():
    root = os.getcwd()
    imgPath = os.path.join(root, 'images/restaurant.png')
    img = cv.imread(imgPath)
    img = cv.cvtColor(img, cv.COLOR_BGR2RGB)
   
    src = np.array([[477,539], [1476,748], [428,786], [1520,905]], dtype=np.float32)

    width = 1000
    height = 200

   
    dest = np.array([[0,0], [width,0], [0,height], [width,100]], dtype=np.float32)
    
    transformation = cv.getPerspectiveTransform(src, dest)
    warpedImg = cv.warpPerspective(img, transformation, (width, height))


    plt.figure()
    plt.subplot(121)
    plt.imshow(img)
    plt.plot(src[:,0], src[:,1], 'r.')

    plt.subplot(122)
    plt.imshow(warpedImg)
    plt.plot(dest[:,0], dest[:,1], 'r.')
    plt.show()

    

if __name__ == '__main__':    
    print("Start")
    perspectiveTransform()

import os

import cv2 as cv

import numpy as np

import matplotlib.pyplot as plt

def perspectiveTransform():

root = os.getcwd()

imgPath = os.path.join(root, 'images/restaurant.png')

img = cv.imread(imgPath)

img = cv.cvtColor(img, cv.COLOR_BGR2RGB)

src = np.array([[477,539], [1476,748], [428,786], [1520,905]], dtype=np.float32)

width = 1000

height = 200

dest = np.array([[0,0], [width,0], [0,height], [width,100]], dtype=np.float32)

transformation = cv.getPerspectiveTransform(src, dest)

warpedImg = cv.warpPerspective(img, transformation, (width, height))

plt.figure()

plt.subplot(121)

plt.imshow(img)

plt.plot(src[:,0], src[:,1], 'r.')

plt.subplot(122)

plt.imshow(warpedImg)

plt.plot(dest[:,0], dest[:,1], 'r.')

plt.show()

if __name__ == '__main__':

print("Start")

perspectiveTransform()

To run the program, type at the terminal

python3 Main.py

1	python3 Main.py

Folder Structure:

Reference

OpenCV Perspective Transform Youtube

Markah Diperlukan Untuk Menang Memanah Recurve Peringkat MSSD Petaling Perdana & MSSM

Berapakah Markah Memanah Recurve Yang Diperlukan Untuk Menang Peringkat MSSD Petaling Perdana dan Peringkat MSSM untuk Lelaki Bawah 12 tahun?

Untuk daerah Petaling Perdana, U12 markah purata setiap pusingan untuk menang ialah 332 manakala peringkat MSSM ialah 352 ini berdasarkan markah MSSD Petaling Perdana 2024 dan MSSM 2024.

Markah Memanah MSSD Petaling Perdana 2024 – Lelaki Bawah 12 Tahun

Markah Memanah MSSM 2024 – Lelaki Bawah 12 Tahun

SKBJ Archery Club – Wolfpack Training

My son Dien joins archery club since June 2023 and he joined it because of friends influence. At first, I didn’t give much attention to his interest because I thought I would die off in a matter of months.

But Dien consistently went to training and kept asking to buy him a bow. Until he joined MSSD last June 2024 only then we bought him a bow. From there on we start to seriously focus on his interest.

Training at SKBJ Archery Wolfpack – Wolfpack

Training is every Saturday from 8AM till 10AM.

hadien practising archering shooting for 15m

After Training

This week 20/6/2024, only 2 kids left after they finished training to practice their shooting. I let him play till 1030AM.

only 2 arhcers left after 10am - end of training — only 2 arhcers left after 10am – end of training

Buying Stair Noses at Shopee

Replace & Tighten Loose Stair Nose

My contractor Contact Number