error occurred when comparing string with php

Question

<?php
    var_dump('00E73694765433'=='0');  //true
    var_dump('0134b40fsbi94u8'=='0'); //false
    var_dump('0134b40fsbi94u8'=='134'); //false
    echo PHP_EOL;
    var_dump(is_numeric('00E73694765433'));//true
    var_dump(is_numeric('0134b40fsbi94u8'));//false
?>

As the code showed,I got into a problem when I compared two strings.I could not understand how the result came even I refered to the official manual. Can anyone help me? Thank you very much!

score 2 · Answer 1 · answered Jun 15 '17 at 08:53

2

<?php
    var_dump('00E73694765433'==='0');  //false
    var_dump('0'==='0');  //true
    var_dump('0134b40fsbi94u8'==='0'); //false
    var_dump('0134b40fsbi94u8'==='134'); //false
    var_dump('0134b40fsbi94u8'==='0134b40fsbi94u8'); //true
?>

Use === instead of ==

answered Jun 15 '17 at 08:53

Komal K.

450
2
13

I just want to know why this happened,thank you anyway! – XjChen Jun 15 '17 at 09:32
I got the answer. Because of the letter 'E',so the first string is transferred to '0',however the second is transferred to '134'. That is my answer,thank you! – XjChen Jun 15 '17 at 09:35
== just checks value while === checks datatype. – Komal K. Jun 15 '17 at 10:21
https://stackoverflow.com/questions/6316784/what-is-the-difference-between-and-in-php – Komal K. Jun 15 '17 at 10:23

error occurred when comparing string with php

1 Answers1