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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$list = [
[
"ID" => 8,
"CONTRACTOR_ID" => 1,
],
[
"ID" => 8,
"CONTRACTOR_ID" => 1,
],
[
"ID" => 8,
"CONTRACTOR_ID" => 2,
],
];
echo count(
array_unique(
array_column($list, "CONTRACTOR_ID")
)
);