PHP関連文法

1.PHPは文字列長を取得する:

$length = strlen($str);

 
 
2.PHPは文字がNULLかどうかを判断する:
 

if(!$str){
   echo "false"

}else {
   echo "true"

}

 
3.link_toの使用:

<?php echo link_to($question->getUser(), 'user/show?id='.$question->getUserId()) ?>

 
 
4.PHP切り取り文字列:

1.split
$arr = array();
$arr = split("/",$str); 

5.PHP置換文字列:

1. str_replace("-" , "/" , $str)
"-" =       
"/" =       

2.       ：
$arr = array("0","1","2","3","4","5","6","7","8","9");
$repNum2 = str_replace($arr,"",$str);

 
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6.PHP取得配列長:

$i=count($array_name);

 
7.PHP取得現在時間:

$current_date = date("Ymd");