Introduction to the use of strtr function in PHP (str_replace)_PHP tutorial

strtr has two forms:

string strtr ( string $str , string $from , string $to )
string strtr ( string $str , array $replace_pairs )
When using the first one At this time, the string lengths of the parameters $from and $to must be the same, otherwise the extra characters (whether there are more $from or more $to) will be ignored.

For example, $str = 'a-=b' ;

When $from='-=', $to='CD', output 'aCDb', because '-=' is the same length as 'CD', there is no problem.

When $from='-=', $to='CDE', 'aCDb' is output, and the 'E' in $to is ignored.

When $from='-=', $to=' C', outputs 'aC=b', and the '=' in $from is ignored.

When using the second form, there is no such problem, and the extra entries will not be ignored.

So, if you deliberately use the strtr function instead of str_replace, and use the first form, you must pay attention to this feature, which may be a trap.

http://www.bkjia.com/PHPjc/324334.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/324334.htmlTechArticlestrtr has two forms: string strtr ( string $str , string $from , string $to ) string strtr ( string $str , array $replace_pairs ) When using the first method, the characters of parameters $from, $to...