$fruit = "apple";
$fruits = array("apple","banana","orange","pear");
if( in_array($fruit,$fruits) )
echo "$fruit 已经在数组中";
$fruit["apple"] = "red";
$fruit["banana"] = "yellow";
$fruit["pear"] = "green";
if(array_key_exists("apple", $fruit)){
printf("apple's color is %s",$fruit["apple"]);
}
$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$founded = array_search("green", $fruits);
if($founded)
printf("%s was founded on %s.",$founded, $fruits[$founded])
$fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $keys = array_keys($fruits); print_r($keys);
$fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $values = array_values($fruits); print_r($values);
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