[PHP] explain these testresults (search/replace)

1.7303379774094 seconds with strtr() 1.557923078537 seconds with preg_replace() 1.494078040123 seconds with str_replace() 1.4984160661697 seconds with ereg_replace() /* source ---8<---*/ " => "PRE", ""=>"LI", " "TABLE ROW START", "" => "BOLD", " "TABLE CELL START"

[PHP] explain these testresults (search/replace)

1.7303379774094 seconds with strtr() 1.557923078537 seconds with preg_replace() 1.494078040123 seconds with str_replace() 1.4984160661697 seconds with ereg_replace() /* source ---8<---*/ " => "PRE", ""=>"LI", " "TABLE ROW START", "" => "BOLD", " "TABLE CELL START"