AND/and/&& OR/or/|| etc. 
Use 'AND' rather than 'and' or '&&', and 'OR' rather than 'or' or '||'.
if ($var1 && $var2 || $var3)

if ($var1 and $var2 or $var3)

if ($var1 AND $var2 OR $var3)
Capitalize 'AS' in foreach statements.
foreach($array AS $key => $val)
{
    // do something
}
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