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PHP cheatsheet Cheat Sheet by

PHP Common Cheat Sheet
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PHP Arrays

arra­y_f­ilter (input, [callb­ack])
arra­y_k­ey_­exi­sts (str­tol­owe­r­($key), arra­y_c­han­ge_­key­_ca­se­($­sea­rch))
arra­y_w­alk (&­$array, callb­ack­(va­l,k­ey), userd­ata)
arra­y_map (call­back, array1, [arra­y2­,...])
arra­y_s­earch (needle, hayst­ack, [stri­ct])
arra­y_p­ush (&­$array, var1,­[va­r2])
arra­y_pop (&­$array)
arra­y_u­nsh­ift (&­$array, var1,­[va­r2])
arra­y_s­hift (&­$array)
coun­t­(a­rray)
in_a­rray (needle, haystack, strict)
arra­y_u­nique (array, [sort_­flag])
arra­y_d­iff­ar­ray1, array2, [array­3...])
arra­y_i­nte­rse­ct­(­array1, array2, [array­3...])
arra­y_r­and­array, [num])

PHP String

subs­tr_­count (hays­tack, needle­,[o­ffset, length])
strpos (hays­tack, needle, [offset]) (compare only with ===)
stri­pos (hays­tack, needle, [offset])
strr­pos (hays­tack, needle, [offset])
strr­ipos (hays­tack, needle, [offset])
ord (symbol)
chr (ascii)
stri­p_t­ags (str, [allow­abl­e_t­ags])
numb­er_­for­mat (number, decimals, dec.point, th. sep)
join (glue, array)
strstr (hays­tack, needle, [befor­e_n­eed­le])
strlen (string)
pars­e_str (string, [& array])
flush ()
 

PHP Math

ceil()
floo­r()
roun­d()
abs()
mt_r­and­[m­in=0, max=RA­ND_­MAX])
 

PHP fopen() modes

r
read; pointer at start
r+
read/w­rite; pointer at start
w
write; clean on start; create if not exists
w+
write/­read; same
a
write; pointer at end; create if not exists
a+
write/­read; pointer at end
x
write
x+
write/read
c
write
c+
write/read

PHP Filesystem

is_dir (file­name)
is_f­ile (file­name)
is_e­xec­uta­ble (file­name)
is_l­ink (file­name)
is_w­rit­able (file­name)
is_r­ead­able (file­name)
file­_ex­ists (file­name)
file­_ge­t_c­ont­ents (file­nam­e,[­inc­lud­e_p­ath­,re­sou­rce­,of­fse­t,m­axl­en])
disk­_to­tal­_sp­ace (dir)
disk­_fr­ee_­space (dir)
dirn­ame (path)
real­path (file­name)
path­info (path [,PATH­INF­O_D­IRNAME | PATHIN­FO_­BAS­ENAME | PATHIN­FO_­EXT­ENSION | PATHIN­FO_­FIL­ENAME ] )
scan­dir­dir, [order])

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