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PHP常用字符串函数十例1. printf() 输出格式化的字符串。可使用占位符自定义输出内容
函数的四种类型1,自定义函数 function demo1($a,$b){ return $a+$b;}echo demo1(1,2).''; 2,系统函数,系统自带的函数无需定义可以直接使用,例如:isset()函数 $text='www.p...