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def blank?
    self.respond_to?(:empty?) ? self.empty? : !self
end

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def is_blank(value):
    return False if value is not False and value in [0, 0.0] else not value

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<?php
function a($href, $text=NULL, $attributes=NULL) {
    if (!isset($text))
        $text = strpos((string)$href, 'mailto:') !== FALSE ? substr($href, 7) : $href;
    $attributes = compact('href') + (array)$attributes;
    return sprintf('<a%s>%s</a>', join_attributes($attributes), (string)$text);
}
function join_attributes($attributes) {
    $attrs = array();
    foreach ((array)$attributes as $key => $value)

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<?php
function hsc($value, $args=NULL) {
    $default_args = array('flags'=>ENT_COMPAT, 'encoding'=>'UTF-8', 'double_encode'=>FALSE);
    extract(array_merge($default_args, (array)$args));
    return htmlspecialchars((string)$value, (int)$flags, (string)$encoding, (bool)$double_encode);
}

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<?php
/**
 * Select a subset of an associative array by providing the keys.
 *
 * @param array $assoc
 * @param array $keys
 * @return array
 */
function array_select(array $assoc, array $keys) {
    return array_intersect_key($assoc, array_flip($keys));

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<?php
/**
 * Remove a subset of an associative array by providing the keys.
 *
 * @param array $assoc
 * @param array $keys
 * @return array
 */
function array_remove(array $assoc, array $keys) {
    return array_diff_key($assoc, array_flip($keys));

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<?php
function mb_substr_replace($string, $replacement, $start, $length=NULL) {
    if (is_array($string)) {
        $num = count($string);
        // $replacement
        $replacement = is_array($replacement) ? array_slice($replacement, 0, $num) : array_pad(array($replacement), $num, $replacement);
        // $start
        if (is_array($start)) {
            $start = array_slice($start, 0, $num);
            foreach ($start as $key => $value)

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Markdown:
[JP Markdown](https://wordpress.org/plugins/jetpack-markdown){.target-blank .rel-nofollow}

JavaScript (just before the closing </body> tag):
<script>
jQuery('.target-blank').attr('target', '_blank').removeClass('target-blank').filter('[title=""]').removeAttr('title').filter('[class=""]').removeAttr('class');
jQuery('.rel-nofollow').attr('rel', 'nofollow').removeClass('rel-nofollow').filter('[title=""]').removeAttr('title').filter('[class=""]').removeAttr('class');
</script>

Post-jQuery HTML:

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// Usage: "abc{def}ghi".p({def:"xyz"}); => "abcxyzghi"
String.prototype.p = function(obj) {
    return this.replace(/\{[^\}]+\}/g, function(key) {
        return obj[key.replace(/^\{([^\}]+)\}$/, "$1")] || key;
    });
};

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window.location.href returns the URL of the current page
http://www.example.org:8888/foo/bar/index.html?q=baz&w=io#bang

window.location.origin returns the protocol, hostname and port number of a URL
http://www.example.org:8888

window.location.protocol returns the web protocol used (http:// or https://)
http:

window.location.hostname returns the domain name of the web host