The FIELD_EXISTS function in PHP MySQL checks whether a column exists in a specified table. This function returns a Boolean (TRUE/FALSE) value depending on whether the column exists or not.
Example 1: Checking whether a column named "email" exists in the customers table:
Example 2: Adding a new column named "address" to the customers table only if it doesn't already exist:
This function is part of the mysqli extension package in PHP.
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