What do you know about the role of PHP curly braces?

!--? php /** *php curly braces Cases Urealyticum *site http://bbs.it-home.org */ $arr =array (0=>123, ' name ' = ' piglet '); foreach ($array as $k = $v) { echo "select * from Blog_blogs where blog_tags like '%{$arr [$k]}% ' ORDER BY BLOG_ID "; Add a curly brace just as the marker for the variable } echo ' '; foreach ($array as $k = $v) { echo "select * from Blog_blogs where blog_tags like '%{{$arr [$k]}}% ' order by blog_id "; Add two curly braces, the outer layer will be the normal character } //curly braces to differentiate the variable //echo "$arr [' name ']";//Use this sentence to report grammatical errors Echo "{$arr [' name ']}";//This sentence is normal, the characters in the curly braces will be treated as variables //$STR {4} After the variable of the string, the {} curly braces and the brackets are the same as the string variable as the array processing $str = ' ABCDEFG '; echo $str {4}; ? copy code

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