问题
I'm trying to retrieve a record from my database using Eloquents find method, however, it's unexpectedly returning null. If I run the query manually on the database then it returns the expected record.
I'm using the following in Laravel:
$support = Support::find(02155);
And the following directly on the database:
SELECT * FROM support WHERE id = 02155;
The primary key column is named 'id' with type smallint(5), unsigned and zerofill along with auto increment set. I based the above 'manual' query on the Laravel documentation according to what Laravel should be executing.
There aren't any errors reported (that I can see) and if I alter Eloquent method to 'all' then all of the records are correctly returned.
回答1:
This is caused because numbers starting with 0 are considered an octal by PHP, as per: http://php.net/manual/en/language.types.integer.php
It seems that PHP converts the number to a decimal before executing the MySQL query which means the query is formed with an incorrect number.
For example:
Support::find(02155);
Becomes:
'SELECT * FROM mytable WHERE id = 1133'
The Solution
I resolved this by typecasting the number to an integer using (int) before I used it with Eloquents find method. It will also work if you pass the number as a string (i.e. in quotes), like so:
Support::find('02155');
来源：https://stackoverflow.com/questions/15326140/laravel-eloquent-find-returning-null