debug_print_backtrace funktsiyasi

debug_print_backtrace funktsiyasi joriy chaqiruvlar steki - bajarishning joriy nuqtasiga olib kelgan funksiyalar ketma-ketligi haqida ma'lumot chiqaradi. Funktsiya qiymat qaytarmaydi, balki natijani darhol chiqaradi. Birinchi parametr sifatida chiqarish formatini o'zgartirish uchun bayroqlarni, ikkinchi parametr sifatida chiqariladigan darajalar sonini cheklashni ko'rsatish mumkin.

Sintaksis

phpdebug_print_backtrace(int $options = 0, int $limit = 0): void

Misol

Funktsiyani chaqirishning oddiy misoli:

php<?php
  function a() {
    b();
  }
  function b() {
    debug_print_backtrace();
  }
  a();
?>

Kod bajarish natijasi:

php#0  b() called at [test.php:4]
#1  a() called at [test.php:8]

Misol

Chiqishni cheklash uchun limit parametridan foydalanish:

php<?php
  function x() {
    y();
  }
  function y() {
    z();
  }
  function z() {
    debug_print_backtrace(0, 2);
  }
  x();
?>

Kod bajarish natijasi:

php#0  z() called at [test.php:9]
#1  y() called at [test.php:6]

Misol

Chiqish formatini o'zgartirish uchun opsiyalardan foydalanish:

php<?php
function test1() {
  test2();
}
function test2() {
  debug_print_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
}
test1();
?>

Kod bajarish natijasi (funksiya argumentlarisiz):

php#0  test2() called at [test.php:4]
#1  test1() called at [test.php:8]

Shuningdek qarang