capitalize                          [首字母大写]       
nl2br                                 [换行符替换成<br>]              
count_characters             [计算字符数]           
regex_replace                  [正则替换]             
cat                                    [连接字符串]                 
replace                             [替换]                  
count_paragraphs            [计算段落数]        
spacify                             [插空]                            
count_sentences              [计算句数]     
count_words                    [计算词数]         
date_format                    [时间格式]                
default                             [默认]                         
escape                          [转码]               
indent                             [缩进]               
lower                                [小写]               
string_format                  [字符串格式]     
strip                               [去除html标签]
truncate                         [截取]                                                                                                        upper                              [大写]           
wordwrap                       [行宽约束]