A detailed description of the filter properties in WordPress development and the use of SQL statements, _php Tutorial

A detailed description of the filter properties in WordPress development and the use of SQL statements function,

Esc_attr () (Filter properties)
It is generally written in the following format when writing the tag attributes of the Html code:

What if the Value property is dynamic output?

However, if the dynamic output attributes include double quotes, angle brackets, and other special characters, the Html code will be scrambled, then you can use the esc_attr () function to escape the output properties.

How to use

Esc_attr ($text);

Parameters

$text (String) (must) the string to be escaped. Default value: None

return value

Returns the escaped string.

Example

Other

This function is located at: wp-includes/formatting.php

Esc_sql () (Filter SQL statements)
Esc_sql () is used to filter the strings that are prepared to be added to the SQL statement, preventing SQL injection and SQL statements from being disturbed by data.

Usage

Esc_sql ($data);

Parameters

$data

(string) (must) the string to filter.

Default value: None

return value

(string) returns the filtered string, which can be added directly to the SQL statement.

Example

$name = Esc_sql ($name); $status = Esc_sql ($status); $wpdb->get_var ("Select something from table WHERE foo = ' $name ' and status = ' $status ');

More

This function is located at: wp-includes/formatting.php

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