A few questions about inserting PDO placeholders in the like statement of MYSQL

Source: Internet
Author: User
I have asked a few questions about inserting PDO placeholders in the like statement of MYSQL. The first one is to query a string using the like '% somestring %' method? Are there any optimization methods or measures, such as binaryfiledlike '% x %'? the second one is: Are there any SQL injection vulnerabilities in queries related to like statements? Because I have little knowledge about this, I would like to ask a few questions about inserting PDO placeholders in the like statement of MYSQL.
First, is it possible to query a string using the like '% somestring %' method? Are there any optimization methods or measures, such as binary filed like '% x % ..
Second, is there any SQL Injection Vulnerability in queries related to like statements? This is because I know little about it.

Finally, I want to know other things to pay attention ~ Thank you ~

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