php开发常用函数总结

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http_build_query()  <?php  $data = array('foo'=>'bar',                'baz'=>'boom',                'cow'=>'milk',                'php'=>'hypertext processor');  echo http_build_query($data);  foo=bar&baz=boom&cow=milk&php=hypertext+processor  ?>

mktime()
<?php
// 输出：October 3, 1975 was on a Friday
echo "Oct 3, 1975 was on a ".date("l", mktime(0,0,0,10,3,1975)) . "<br><br>";
//在进行日期计算和验证时会用到 mktime() 函数
//它会对超出范围的输入值自动计算正确的值：
echo date("M-d-Y",mktime(0,0,0,12,36,2001)) . "<br>";
echo date("M-d-Y",mktime(0,0,0,14,1,2001)) . "<br>";
echo date("M-d-Y",mktime(0,0,0,1,1,2001)) . "<br>";
echo date("M-d-Y",mktime(0,0,0,1,1,99)) . "<br>";
?>
Oct 3, 1975 was on a Friday
Jan-05-2002
Feb-01-2002
Jan-01-2001
Jan-01-1999
$today=mktime(0,0,0,date('m'),date('d'),date('Y'));

mb_strlen
<?php
//测试时文件的编码方式要是UTF8
$str='中文a字1符';
echo strlen($str).'<br>';//14
echo mb_strlen($str,'utf8').'<br>';//6
echo mb_strlen($str,'gbk').'<br>';//8
echo mb_strlen($str,'gb2312').'<br>';//10
?>

strip_tags()
<?php
$text = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>';
echo strip_tags($text);
echo " ";
// 允许 <p> 和 <a>
echo strip_tags($text, '<p><a>');
?>
Test paragraph. Other text
<p>Test paragraph.</p> <a href="#fragment">Other text</a>

array_push()
<?php
$a=array();
array_push($a,"blue","yellow");
print_r($a);
?>
Array
(
    [0] => blue
    [1] => yellow
)

array_merge()
<?php
$a1=array("red","green");
$a2=array("blue","yellow");
print_r(array_merge($a1,$a2));
?>
Array
(
    [0] => red
    [1] => green
    [2] => blue
    [3] => yellow
)

mb_substr()
<?php
$aaa = "this这是中文字符串";
echo mb_substr($aaa,0,6,'UTF-8');//输出值为: this这是

strtotime
<?php
echo strtotime(date("Y-m-d",time())); //1483632000
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