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//How to fix “this file type is not permitted for security reasons” in WordPress

function enable_extended_upload ( $mime_types =array() ) {
 
   // The MIME types listed here will be allowed in the media library.
   // You can add as many MIME types as you want.
   $mime_types['gz']  = 'application/x-gzip';
   $mime_types['zip']  = 'application/zip';
   $mime_types['rtf'] = 'application/rtf';
   $mime_types['ppt'] = 'application/mspowerpoint';

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/* Dynamically add options to select field */
// Assuming 'custom-select' is the class of select field


<select class="custom-select">
<option value="a">A</option>
<option value="b">B</option>
<option value="c">C</option>
</select>

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* To replace all runs of white spaces in a string with ( _ ) underscore  =>  /\s+/g
    -> Replace adjacent white spaces with a single underscore
    
* To replace whitespace in a string with underscore   =>    / /g
    -> Replace each white space with a single underscore. Each adjacent white spaces will be replaced

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// Replace multiple strings with multiple values

var str = "I have a cat, a dog, and a goat.";
var mapObj = {
   cat:"monkey",
   dog:"goat",
   goat:"cat"

};
str = str.replace(/cat|dog|goat/gi, function(matched){

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function readURL(input){
   if (input.files && input.files[0]) {
      var reader = new FileReader();
      reader.onload = function (e) {
         //e.target.result ->contain image url in encoded form
         //Do action with e.target.result here. Dont place outside onload function. won't work
      };
      reader.readAsDataURL(input.files[0]);
  }
 }

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// Remove all data attributes of an element


$.each( $("element-selected").data(), function(i){ 
  $("div").removeAttr("data-" + i); 
});

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<?php
$mailer = WC()->mailer();
$mails = $mailer->get_emails();
$emails = wc()->mailer()->emails; // Contains all WooCommerce email classes with details
?>

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<?php

// Change product title for products in shop page
remove_action( 'woocommerce_shop_loop_item_title','woocommerce_template_loop_product_title', 10 );
function change_product_title() {
	$additional_text = ' More info';
	echo '<h2 class="woocommerce-loop-product__title">' . get_the_title() .$additional_text.'</h2>';
}
add_action('woocommerce_shop_loop_item_title','change_product_title');

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<?php
$val = preg_replace('/&.*?;/', '', $val);

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<?php

function strSlice($str, $start, $end) {
	$end = $end - $start;
	return substr($str, $start, $end);
}

$name = 'migthegreek';
// Get substr from index 3 to 6
echo strSlice($name, 3, 6);