About echo and var_dump

$a = "";
echo $a br / blank
var_dump ($a); / / string""(length=17)
? >
Why is it not output when echo?

Php
Mar.22,2021
The

code is fine. You must have executed it wrong.


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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-64f5-1b367de-2b796.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b367de-2b796.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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