In the php statement, what is the operator?

as mentioned above, you can see the following line in the code:

return $teacher_name ?: "----";
What is the name of this operator, please? What does it mean?

Jul.23,2021

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Ternary operator:


return $teacher_name ?: '----';

equals

return $teacher_name ? $teacher_name : '----';
Shorthand for

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b304a5-2bd16.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b304a5-2bd16.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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