How to determine whether the query result is empty in php

php method to determine whether the query result is empty: 1. Use the sql method, the code is [select count(people) c from people where people='Lele']; 2. Use the php method, the code is [$p=$_POST['p'];].

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php method to determine whether the query result is empty:

1,

select count(people) c from people where people='乐乐'

The above sql is the principle

2,

php utilization code

query("select count(people) c from people where people='".$p."'");
foreach($ps as $s){
if ($s['c']=='0'){
echo "用户可用";
}else{
echo "此用户名已存在";
}
} 
?>

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