How to check for duplicates in PHP database?

How to check for duplicates in PHP database?

First, you need a simple PHP function to check whether this record exist in the DB or not, like the one below: function is_exist($table, $data) { $sql = “SELECT * FROM `” . $table . “` WHERE “; foreach ($data as $key => $val) : $sql .= “`$key`='” . $val .

How to prevent duplicate entries in PHP SitePoint?

Cups suggested that with a unique index you don’t have to use a SELECT to check for an existing email like you did at the beginning of your code – you could simply INSERT straight away and then check if the query returned an error – if mysql_errno is 1062 then you display ‘Email Address is Already in Use…’.

How to prevent duplicate entries into the database?

Here is some info on the Mysql UNIQUE index also check the mysql manual page. Then upon failure to add an email address because the UNIQUE index has been triggered, you will find your database will issue an error number, in mysql this is number 1062.

When is a duplicate considered a duplicate in Stack Overflow?

To me, a duplicate is only considered a duplicate when name, description, price, city, and enddate match. Stack Overflow About Products For Teams Stack OverflowPublic questions & answers Stack Overflow for TeamsWhere developers & technologists share private knowledge with coworkers

First, you need a simple PHP function to check whether this record exist in the DB or not, like the one below: function is_exist($table, $data) { $sql = “SELECT * FROM `” . $table . “` WHERE “; foreach ($data as $key => $val) : $sql .= “`$key`='” . $val .

How to remove duplicate values in MySQL Query?

We removed duplicate values using ‘DISTINCT’ key in mysql query, if it is present in table. We can check whether the value is present in table or not using PHP and Mysql before add data to table. We can also avoid duplicate values storing in mysql table while inserting by primary key. Consider following example.

How to avoid duplicate entries in a database?

This blog will help user learn how to avoid the duplicate entries in the database. Storing duplicate values in the table must be avoided while inserting data in the database table. As these duplicate entries can create many problem in the application.

How to avoid duplicate values storing in table?

Otherwise the value is already present in table. you can also use mysql_fetch_row () instead of mysql_num_rows (). If the value is present in table, it could not be stored in table. Now you can avoid duplicate entries in table using PHP and Mysql.

Do you need to delete all duplicate rows in MySQL?

The data is partitioned by id and within each partition there are unique row numbers. Unique values are labeled with row number 1, while duplicates are 2, 3, and so on. Therefore, to remove duplicate rows, you need to delete everything except the ones marked with 1.

How to check if an array is unique in PHP?

Taking the advantage of array_unique, here is a simple function to check if an array has duplicate values. It simply compares the number of elements between the original array and the array_uniqued array. The above code returns an array which is both unique and sorted from zero. It is also adaptable to multi dimensional arrays.

Which is the best way to log PHP errors?

Log PHP Errors Through the Web Server Configuration. To avoid changing parameters in the .htaccess or adding some lines in the PHP code to show errors, then the best way to log errors is defining it in the web server configuration file. ErrorLog “/var/log/apache2/my-website-error.log”.

How to remove duplicates from an array in PHP?

The array_unique () function removes duplicate values from an array. If two or more array values are the same, the first appearance will be kept and the other will be removed. Note: The returned array will keep the first array item’s key type. Required. Specifying an array Optional. Specifies how to compare the array elements/items.

How to handle duplicate entries in MySQL Stack Overflow?

You should always seek to avoid the use of magic numbers (I know, I was the one to introduce it in this answer). Instead, you could assign the known error code ( 1062) to a constant (e.g. MYSQLI_CODE_DUPLICATE_KEY ).

When does duplicate entry error occur in PHP?

Users have reported that the error has commonly occurred when using the SQL. The error appears when updating the tables. Furthermore, the error has occurred in several scenarios which include using Laravel, PHP, Atlassian, Joomla, and similar web development and databases.

Taking the advantage of array_unique, here is a simple function to check if an array has duplicate values. It simply compares the number of elements between the original array and the array_uniqued array. The above code returns an array which is both unique and sorted from zero. It is also adaptable to multi dimensional arrays.