The double quote could have the variable inside.

$name = 'Eric';
$greeting1 = "Hello $name";
$greeting2 = 'Hello $name';
echo $greeting1; // Hello Eric 
echo $greeting2; // Hello $name

Iterator in php

Use glob to get file names in the system.

$theme_path = '/theme/path';
foreach (glob($theme_path . "/preprocess/*.inc") as $file) {
  require_once $file;
}

Use array_map function to call a function multiple times, every time one element will be assign as parameter.

// Drupal 'theme' function will get the corresponding template back.
// The result will be stored in array.
$rendered_html = array_map('theme', [
    'theme1',
    'theme2',
    'theme3',
]);

Use array_reduce function to call a function iteratively, reduce the array to single value.
Use array_merge function to override default value in array (e.g. extend/override configuration).

  $block_default = ['cache' => DRUPAL_NO_CACHE, 'category' => t('CATEGORY')];
  $blocks['BLOCK1'] = array_merge($block_default, [
    'info' => t('BLOCK ONE'),
  ]);
  $blocks['BLOCK2'] = array_merge($block_default, [
    'info' => t('BLOCK TWO'),
  ]);
  $blocks['BLOCK3'] = array_merge($block_default, [
    'info' => t('BLOCK THREE'),
  ]);

Use array_fill_keys to assign same value to all the elements in an array

$keys = array('Batman', 'Superman', 'Spiderman', 'Ironman');
$a = array_fill_keys($keys, 'Marvel Comics');

Use array_filter to remove the empty value.

Type Conversion

// Use type conversion to make the function accept both number and array as data type.
function foo_bar($arg1) {
  $result = 0;
  foreach ((array) $arg1 as $value) {
      $result += $value;
  }
  return $result;
}
print foo_bar(1);     // Output 1.
print foo_bar([2,3]); // Output 5.

Require vs include

require is identical as include, except it can throw error when failure.

require_once will check if the file has already been included.

Isset vs empty vs isnull

isset return true when the variable is not null
empty return true when the variable is an empty string / false / array() / null / 0 and a unset value.
isnull is opposite as isset, return true when null

Some Utility Sample

Get function with the default value

function _get(&$var, $default = NULL) {
  return !empty($var) ? $var : $default;
}

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php basicSingle quote vs double quoteIterator in phpType ConversionRequire vs includeIsset vs empty vs isnullSome Utility Sample Iterator in php Type Conversion Require vs include Isset vs empty vs isnull Some Utility Sample

Iterator in php

Type Conversion

Require vs include

Isset vs empty vs isnull

Some Utility Sample

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