What is the difference between searching for dollar signs in array keys versus array values in PHP?

When searching for dollar signs in array keys, you are looking for the presence of the dollar sign character ($) in the array keys themselves. On the other hand, when searching for dollar signs in array values, you are looking for the dollar sign character within the values stored in the array. To search for dollar signs in array keys, you can use the array_key_exists() function. To search for dollar signs in array values, you can loop through the array and use strpos() function to check for the presence of the dollar sign in each value. 

// Search for dollar signs in array keys
$array = ['$key1' => 'value1', 'key2' => 'value2'];

if (array_key_exists('$key1', $array)) {
    echo "Dollar sign found in array key!";
} else {
    echo "Dollar sign not found in array key.";
}

// Search for dollar signs in array values
$array = ['key1' => '$value1', 'key2' => 'value2'];
$hasDollarSign = false;

foreach ($array as $value) {
    if (strpos($value, '$') !== false) {
        $hasDollarSign = true;
        break;
    }
}

if ($hasDollarSign) {
    echo "Dollar sign found in array values!";
} else {
    echo "Dollar sign not found in array values.";
}

Keywords

array keys array values searching PHP difference

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