Codex

Function Reference/get category by slug

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The get_category_by_slug() function is used to retrieve the ID of a category from its associated slug. This function accepts the category slug (in string format) and returns the corresponding numerical ID in the term_id property. 

<?php 
  $idObj = get_category_by_slug('category-name'); 
  $id = $idObj->term_id;
?>

Practical Use: 

<?php echo category_description(get_category_by_slug('category-slug')->term_id); ?>
Retrieved from "http://codex.wordpress.org/Function_Reference/get_category_by_slug"

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