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PHP 老师没教过你的那些知识点

  • 2026-03-24 20:18:55
PHP 老师没教过你的那些知识点


另类的写法有惊喜

我们在阅读某些源代码的时候会发现有一种另类的写法,比如

//异常写法
if(false == $result)
//正常写法
if($result == false)

其实这是一种很聪明的写法,它可以很大程度上杜绝手误造成的严重 bug。

假如我们在正常方法中把 == 误写成 = ,那么 if($result = false) 就会恒定返回未知值,导致在实际运行中产生未知的 Bug,如果使用异常的写法出现手误变成时 if(false = $false) ,编辑器会抛出一个 error,我们就可以及时发现并修复问题。

‘<?php’开始前不要有空行,php脚本结尾的 ‘?>’ 尽量省略

假如有一个文件在 ?> 后有一个空白行,那么你在使用 session_start() 等方法时,会返回一个警告 headers already sent by xxx ,这是因为 session_start() 要求使用前不能有任何输出。

同理 <?php 前的空行也会存在同样的问题。

字符串和数字在一起时,要留神

var_dump('a'.0); //返回error,语法错误

解决的方案比较简单,只要在.连接左右加上空格就可以防止语法错误。

var_dump ('abc' == 0); //输出true
var_dump ('1abc' == 0); //输出false

这个例子中输出true是不是让你大吃一惊,其实php中将字符串和数字做比较时,会把字符串强制转换为int性,转换规则为 如果字符串是数字开头,那么取开头数字作为转换结果,如果开头不是数字那么就为0


字符串的运算,你惹不起

for ($i = 'a'; $i <= 'z'; ++$i) {
    echo "$i ";
}

你以为会输出从 a 到 z ?那你就错了,亮瞎你的输出结果如下:

a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi bj bk bl bm bn bo bp bq br bs bt bu bv bw bx by bz ca cb cc cd ce cf cg ch ci cj ck cl cm cn co cp cq cr cs ct cu cv cw cx cy cz da db dc dd de df dg dh di dj dk dl dm dn do dp dq dr ds dt du dv dw dx dy dz ea eb ec ed ee ef eg eh ei ej ek el em en eo ep eq er es et eu ev ew ex ey ez fa fb fc fd fe ff fg fh fi fj fk fl fm fn fo fp fq fr fs ft fu fv fw fx fy fz ga gb gc gd ge gf gg gh gi gj gk gl gm gn go gp gq gr gs gt gu gv gw gx gy gz ha hb hc hd he hf hg hh hi hj hk hl hm hn ho hp hq hr hs ht hu hv hw hx hy hz ia ib ic id ie if ig ih ii ij ik il im in io ip iq ir is it iu iv iw ix iy iz ja jb jc jd je jf jg jh ji jj jk jl jm jn jo jp jq jr js jt ju jv jw jx jy jz ka kb kc kd ke kf kg kh ki kj kk kl km kn ko kp kq kr ks kt ku kv kw kx ky kz la lb lc ld le lf lg lh li lj lk ll lm ln lo lp lq lr ls lt lu lv lw lx ly lz ma mb mc md me mf mg mh mi mj mk ml mm mn mo mp mq mr ms mt mu mv mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ns nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op oq or os ot ou ov ow ox oy oz pa pb pc pd pe pf pg ph pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz qa qb qc qd qe qf qg qh qi qj qk ql qm qn qo qp qq qr qs qt qu qv qw qx qy qz ra rb rc rd re rf rg rh ri rj rk rl rm rn ro rp rq rr rs rt ru rv rw rx ry rz sa sb sc sd se sf sg sh si sj sk sl sm sn so sp sq sr ss st su sv sw sx sy sz ta tb tc td te tf tg th ti tj tk tl tm tn to tp tq tr ts tt tu tv tw tx ty tz ua ub uc ud ue uf ug uh ui uj uk ul um un uo up uq ur us ut uu uv uw ux uy uz va vb vc vd ve vf vg vh vi vj vk vl vm vn vo vp vq vr vs vt vu vv vw vx vy vz wa wb wc wd we wf wg wh wi wj wk wl wm wn wo wp wq wr ws wt wu wv ww wx wy wz xa xb xc xd xe xf xg xh xi xj xk xl xm xn xo xp xq xr xs xt xu xv xw xx xy xz ya yb yc yd ye yf yg yh yi yj yk yl ym yn yo yp yq yr ys yt yu yv yw yx yy yz 


时刻小心精度丢失的情况

$f = 0.58;
echo intval($f * 100); // 输出57
sprintf("%.2f",$f * 100); //输出58.00

精度丢失的问题在其他语言中有会有,但是在 PHP 这种弱类型的语言中更加需要注意。

其实上述说到的问题在 PHP 手册中都已经提及到了,手册翻百遍打码如有神,一定的细心加一定的经验,你就能够在开发的路上一路填坑一路前行。

前行路上,参加场 D-Day,交一两好基友也是极好。

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  1. CONNECT:[ UseTime:0.000577s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000571s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005996s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005221s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000690s ]
  6. SELECT * FROM `set` [ RunTime:0.003530s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000644s ]
  8. SELECT * FROM `article` WHERE `id` = 478035 LIMIT 1 [ RunTime:0.004811s ]
  9. UPDATE `article` SET `lasttime` = 1774576629 WHERE `id` = 478035 [ RunTime:0.007273s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000264s ]
  11. SELECT * FROM `article` WHERE `id` < 478035 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011593s ]
  12. SELECT * FROM `article` WHERE `id` > 478035 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006477s ]
  13. SELECT * FROM `article` WHERE `id` < 478035 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010323s ]
  14. SELECT * FROM `article` WHERE `id` < 478035 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007566s ]
  15. SELECT * FROM `article` WHERE `id` < 478035 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006698s ]
0.201779s